Android Phone Won’t Make Calls — 7 Fixes (2026)

By Saif Khan  |  TechFix Radar  |  Updated: July 2026  |  11 min read

I have fixed Android phones that would not make calls on four devices this year. A Samsung Galaxy S24 showing “Call Failed” on every outgoing call — Call Barring had been accidentally enabled during a carrier plan change, blocking all outgoing calls silently. A Pixel 8 that could send texts but not make calls after a carrier network upgrade — VoLTE was disabled and the carrier had shut down its 3G fallback. A OnePlus that dropped every call within 30 seconds — a network type mismatch between 5G NR and the voice call routing. A Xiaomi where no one could hear the caller — the SIM card was slightly misaligned in the tray, causing intermittent modem connection.

The honest reality: over 85% of Android call failures are caused by four things — a failed network registration (Airplane Mode toggle fixes this), Call Barring silently enabled, VoLTE disabled on a carrier that requires it, or a physically misaligned SIM card. All four are fixable in under 3 minutes.

⚡ Can’t Make Calls Right Now? Try These First

1. Airplane Mode toggle: Notification shade → Airplane Mode ON → wait 20 sec → OFF. Forces network re-registration
2. Check Call Barring: Phone app → menu → Settings → Supplementary Services → Call Barring → verify nothing is enabled
3. Enable VoLTE: Settings → Network & Internet → SIM cards → your SIM → VoLTE calls → ON

Identify Your Call Problem Type

🟢 Software / Network Issue

• “Call Failed” error on every call
• Can text but cannot make voice calls
• Calls fail after carrier plan change
• Problem started after Android update
• Calls fail only in certain locations
• → Fix 1 → Fix 3 (Call Barring) → Fix 4 (VoLTE)

🔴 Hardware / SIM Issue

• “No SIM Card” or “No Service” showing
• Calls connect but no audio either way
• Problem after phone was dropped
• SIM tray was recently opened
• Another SIM works fine in same phone
• → Fix 6 (reseat SIM) first

📝 Table of Contents

1. Fix 1: Toggle Airplane Mode
2. Fix 2: Restart the Phone
3. Fix 3: Check and Disable Call Barring
4. Fix 4: Enable VoLTE (Voice over LTE)
5. Fix 5: Change Preferred Network Type
6. Fix 6: Reseat the SIM Card
7. Fix 7: Reset APN / Carrier Settings
8. Quick Reference Table
9. Real Examples: 4 Androids, What Fixed Them
10. Verdict
11. FAQ

1

Toggle Airplane Mode

🔴 HIGH IMPACT✅ NO DATA LOSS⏱ 20 sec

When an Android phone connects to a cell tower, it registers on the network — this registration tells the carrier which tower the phone is on and enables call routing to that device. This registration can fail or become stuck in an invalid state due to tower handoffs, signal fluctuations, or software glitches. When the registration is stuck, the phone shows signal bars but calls fail immediately because the carrier cannot route calls to a phone it does not see as properly registered. Toggling Airplane Mode forces the modem to disconnect from all towers, wait, then perform a completely fresh registration cycle.

1. Pull down the notification shade from the top of the screen
2. Tap the Airplane Mode icon — it turns on (usually highlighted blue or orange)
3. Wait 20 seconds — this allows the modem to fully de-register from the tower
4. Tap Airplane Mode again to turn it OFF
5. Watch the signal bars — wait 30 seconds for a full re-registration
6. Try making a call

💡 If you are in an area with weak signal: after disabling Airplane Mode, walk to a window or outside to give the phone the best chance of registering on a strong tower. A successful registration on a weak signal often leads to dropped calls even after the fix.

✅ Verification: After re-registration, the signal indicator should show a stable number of bars (not fluctuating). Attempt a test call. If it connects and audio works normally, the network registration was the cause. If still failing, proceed to Fix 2.

2

Restart the Phone

🔴 HIGH IMPACT✅ NO DATA LOSS⏱ 2 min

The Android modem (the chip that handles cellular communication) runs its own firmware separate from the main Android OS. This modem firmware can develop memory leaks, invalid state caches, or hung processes that a simple Airplane Mode toggle does not fully reset. A full phone restart shuts down both the Android OS and the modem firmware, allowing both to reinitialise from a clean state. This is why “just restart it” works for call failures that survive an Airplane Mode toggle — the modem firmware needed a complete power cycle, not just a radio toggle.

1. Hold the Power button for 2–3 seconds
2. Tap Restart (not Power Off — Restart performs a full OS + modem firmware cycle)
3. Wait for the phone to fully restart (1–2 minutes)
4. Wait an additional 30 seconds after the home screen appears — the modem needs time to register on the network after boot
5. Try making a call

💡 On Samsung Galaxy devices: hold Power + Volume Down simultaneously for a force restart if the phone is unresponsive. On Pixel devices: hold Power for 8+ seconds. A forced restart (rather than a normal restart) fully power-cycles the modem firmware even if the OS has hung.

💡 Why “Power Off then Power On” is better than Restart in some cases: On certain Android versions, a full shut-down (not restart) discharges modem memory more completely. If Restart alone does not fix call failures, try powering off, waiting 30 seconds, then powering on.

✅ Verification: After a clean restart, make a test call immediately (before any apps load in the background). If call failures only occur after heavy app usage but not immediately after restart, a background app is interfering with the modem — check for apps with Phone permission in Settings → Apps.

3

Check and Disable Call Barring

🔴 HIGH IMPACT✅ NO DATA LOSS⏱ 2 min

Call Barring is a carrier feature that blocks specific categories of calls — all outgoing calls, international calls, incoming calls, or calls when roaming. It is designed as a parental or security feature but is frequently enabled accidentally during carrier plan changes, SIM activations, or when carrier apps reset settings. Once enabled, it silently blocks calls with a “Call Failed” or “Call Rejected” error that is indistinguishable from a network failure. The Samsung Galaxy S24 I diagnosed had “Barring of All Outgoing Calls” active — a carrier plan change had triggered it remotely without any notification.

Path on Stock Android / Pixel:

1. Open the Phone app
2. Tap the three-dot menu (top right) → Settings
3. Tap Calls → Call Barring (may also be under Supplementary Services)
4. Check each barring type — if any shows Active or Enabled, tap it
5. Enter the barring password when prompted
6. Select Disable All

Path on Samsung (One UI):

1. Phone app → three-dot menu → Settings
2. Supplementary services → Call barring
3. Check Voice call barring settings
4. Tap any active barring → enter password → Disable

💡 Default barring password: The default is usually 0000 or 1234. If neither works, contact your carrier — the barring password is set by the carrier and may have been changed. Your carrier can also disable all barring remotely without needing the password.

⚠ If you cannot find Call Barring in your phone’s settings, it may only be configurable through your carrier’s app or customer service. Call your carrier’s support number from a different phone and ask them to check and disable any active call barring on your account.

✅ Verification: After disabling all call barring, attempt an outgoing call immediately. If it connects, Call Barring was the cause. Check your carrier account online or via their app to ensure barring does not get re-enabled by a plan setting.

4

Enable VoLTE (Voice over LTE)

🔴 HIGH IMPACT✅ NO DATA LOSS⏱ 1 min

VoLTE (Voice over LTE) routes phone calls over the 4G LTE data network rather than a dedicated 2G/3G voice channel. As of 2025–2026, most major carriers globally have shut down or severely limited their 2G and 3G networks. Without VoLTE enabled, the Android phone attempts to fall back to these legacy networks to make calls — and fails because the networks no longer exist in that area. The result is a “Call Failed” error every single time, while texting (which runs on LTE data) continues to work. The Pixel 8 I diagnosed had this exact symptom: perfect text delivery, zero call success, because the carrier had switched off 3G in that region and the phone’s VoLTE was toggled off.

Enable VoLTE on Stock Android / Pixel:

1. Settings → Network & internet
2. Tap SIMs (or “Mobile network” or “SIM cards”)
3. Tap your SIM card
4. Find VoLTE calls, HD Calling, or 4G Calling — toggle it ON

Enable VoLTE on Samsung (One UI):

1. Settings → Connections → Mobile networks
2. Tap VoLTE calls → toggle ON

💡 If the VoLTE toggle is greyed out or missing: Your carrier may not have provisioned VoLTE for your account or SIM card. Contact your carrier and ask them to “provision VoLTE” or “enable HD Voice” on your account. This is done on the carrier’s backend and usually takes 5–10 minutes to activate. Some older SIM cards do not support VoLTE — a free SIM replacement from your carrier will solve this.

💡 VoLTE and 5G: On 5G phones, VoLTE is still required for voice calls in most networks. Even when connected to a 5G data network, voice calls typically travel over VoLTE (LTE voice path) or VoNR (Voice over New Radio — native 5G voice). Both require VoLTE to be enabled as the foundation.

✅ Verification: After enabling VoLTE, make a test call. The call should connect significantly faster than before (VoLTE calls connect in 1–2 seconds vs 5–8 seconds on 3G). If the VoLTE option is missing or greyed out, contact your carrier before moving to other fixes.

5

Change Preferred Network Type

🟠 MEDIUM IMPACT✅ NO DATA LOSS⏱ 2 min

Some network configurations fail to correctly hand off voice calls when the phone is connected to a 5G NR (New Radio) non-standalone network. In these configurations, the phone connects to 5G for data but the voice call path is supposed to fall back to LTE — and this handoff fails silently. Forcing the phone to connect on LTE-only or 3G removes the 5G voice handoff requirement and forces it onto a stable, proven voice path. The OnePlus I diagnosed was dropping every call within 30 seconds — it was connecting to a 5G tower that was misconfigured for voice handoff. Switching to LTE-only stopped the drops instantly.

1. Settings → Network & internet → SIMs → tap your SIM
2. Tap Preferred network type
3. Change from 5G (recommended) or LTE/5G to LTE only
4. Test calls on LTE only — if calls work, confirm 5G voice handoff was the issue
5. Optionally: try 3G as a further fallback if LTE calls still fail

💡 On Samsung devices: Settings → Connections → Mobile networks → Network mode. On Pixel: Settings → Network & internet → SIMs → Preferred network type. The option names vary — look for the one that removes 5G from the selection: “LTE/WCDMA/GSM” or “LTE only” or “4G/3G/2G”.

💡 This is a temporary diagnostic fix. If calls work on LTE-only, report the issue to your carrier — the 5G voice handoff failure is a network configuration problem on their end, not a phone hardware issue. Set back to 5G when the carrier confirms they have resolved it.

✅ Verification: After switching to LTE-only, make 3 test calls in succession. If all connect and remain stable for the full duration, 5G voice handoff was the cause. If calls still fail on LTE-only, the issue is not network type — proceed to Fix 6.

6

Reseat the SIM Card

🟢 PHYSICAL FIX✅ NO DATA LOSS⏱ 5 min

The SIM card makes physical electrical contact with the phone’s modem through metal contact points on its surface. If the SIM card is even 0.5mm out of alignment in the tray, these contact points make unreliable connection — the modem intermittently loses the SIM, causing dropped calls, no audio on calls, or complete call failure. This is especially common after the phone has been dropped (jarring the SIM tray), after the SIM tray was recently opened, or in phones where the SIM tray does not lock firmly. The Xiaomi I diagnosed had zero audio on all calls — the SIM was visually in the tray but slightly rotated, causing the modem to intermittently lose the SIM during the voice data load of an active call.

⚠ Power off the phone completely before opening the SIM tray. Removing a SIM while the phone is on can corrupt the SIM’s memory chip in rare cases. Hold Power → Power off → confirm.

1. Power off the phone completely
2. Locate the SIM tray — usually on the left or top edge of the phone
3. Insert the SIM ejector tool (or a straightened paper clip) into the small hole next to the tray
4. Push straight in until the tray pops out
5. Remove the SIM card from the tray
6. Inspect the SIM card and tray for dust, debris, or bent contact pins
7. Gently clean the gold contacts on the SIM card with a dry cloth
8. Re-insert the SIM card firmly and evenly into the tray — it should sit flush with no gaps
9. Push the tray back in until it clicks
10. Power the phone back on and wait 1 minute for network registration
11. Test a call

💡 If you have a dual-SIM phone: try moving the SIM to the other SIM slot. Also test the SIM card in a different phone to confirm the SIM itself is functional. If the SIM works in another phone but not yours, the SIM tray contacts or modem connection point may be physically damaged.

✅ Verification: After reseating, the phone should show “SIM 1” or your carrier name in the status bar within 30 seconds of boot. If “No SIM Card” still shows after reseating, the SIM card itself may be damaged and needs replacement from your carrier.

7

Reset APN / Carrier Settings

🟣 LAST RESORT✅ NO DATA LOSS⏱ 5 min

APN (Access Point Name) settings define how the phone connects to the carrier’s network for data and certain call routing functions. Incorrect or corrupted APN settings can prevent call setup on carriers that route voice calls through specific APN configurations (particularly for VoLTE and IMS — IP Multimedia Subsystem — which is the underlying technology for VoLTE calls). Resetting to carrier defaults removes any incorrect manual entries and replaces them with the correct provisioned settings for your carrier.

Check for Carrier Settings Update:

1. Open the dialer and enter: *#*#4636#*#*
2. Tap Phone Information
3. Scroll down to see carrier name — this confirms the carrier config being used

Reset APN to Default:

1. Settings → Network & internet → SIMs → tap your SIM
2. Tap Access Point Names
3. Tap the three-dot menu (top right)
4. Tap Reset to default
5. Restart the phone

On Samsung:

1. Settings → Connections → Mobile networks → Access Point Names
2. Tap three-dot menu → Reset to default

💡 After resetting APN, if the phone still shows no correct APN profile for your carrier: contact your carrier and ask them to send an “OTA (Over-the-Air) carrier configuration update” to your phone. This pushes the correct APN and IMS settings directly from their server to your device.

⚠ If all 7 fixes have been applied and calls still fail on multiple SIM cards: the modem hardware may be damaged. This requires professional repair. Contact the phone manufacturer’s support or visit an authorised service centre. Do not attempt to repair modem hardware yourself.

✅ Verification: After APN reset and restart, test a call. If the call fails with a different error message than before (e.g. changes from “Call Failed” to “No service”), the APN change had an effect — you may need to manually enter your carrier’s correct APN settings (available on your carrier’s website) rather than using the defaults.

📋 All 7 Fixes at a Glance

#	Fix	Impact	Time	Data Safe?	Best For
1	Airplane Mode toggle	🔴 HIGH	20 sec	✅ Yes	Call Failed / no registration
2	Restart phone	🔴 HIGH	2 min	✅ Yes	Modem firmware hang
3	Disable Call Barring	🔴 HIGH	2 min	✅ Yes	All outgoing calls blocked
4	Enable VoLTE	🔴 HIGH	1 min	✅ Yes	Can text but not call
5	Change network type	🟠 MEDIUM	2 min	✅ Yes	Calls drop on 5G network
6	Reseat SIM card	🟢 PHYSICAL	5 min	✅ Yes	No SIM / no audio on calls
7	Reset APN / carrier settings	🟣 LAST RESORT	5 min	✅ Yes	Persistent failure after above

Real Examples: 4 Androids, What Fixed Them

📱 Samsung Galaxy S24

“Call Failed” on every outgoing call. Call Barring (All Outgoing) silently enabled during carrier plan change. Fix 3 (disabled Call Barring) — calls worked immediately. Password was carrier default 0000.

📱 Google Pixel 8

Perfect texting, zero call success. Carrier shut down 3G. VoLTE was toggled off. Fix 4 (enabled VoLTE) — first call connected in under 2 seconds. All subsequent calls stable.

📱 OnePlus 12

Every call dropped within 30 seconds. Connected to 5G tower with misconfigured voice handoff. Fix 5 (changed to LTE-only) — zero dropped calls. Reported to carrier for network fix.

📱 Xiaomi 14

Calls connected but no audio either direction. SIM slightly rotated in tray causing intermittent modem contact. Fix 6 (reseated SIM) — full audio restored. SIM was 1mm out of alignment.

🔗 Related Android Fixes on TechFix Radar:

• Android Won’t Turn On — 7 Fixes
• Android Bluetooth Not Working — 8 Fixes
• Android Won’t Charge — 7 Fixes

✅ Verdict — Exact Order to Follow

1. Fix 1 first always — Airplane Mode toggle. 20 seconds, zero risk. Fixes stuck network registration instantly.
2. Fix 2 next — Restart. Resets modem firmware. If Fix 1 works temporarily but fails again, Fix 2 often makes it permanent.
3. Every call fails, can text: Fix 4 (enable VoLTE). This is the cause in the majority of post-carrier-update call failures in 2025–2026.
4. All outgoing calls blocked (Call Failed instantly): Fix 3 (Call Barring). Check this before anything else if it started after a plan change.
5. Calls drop mid-call: Fix 5 (change to LTE-only network type). 5G voice handoff failure is increasingly common.
6. No SIM card detected or no audio: Fix 6 (reseat SIM). Physical issues look identical to software problems — rule it out.
7. Nothing else worked: Fix 7 (reset APN) → contact carrier for OTA provisioning → if still failing on multiple SIMs, modem hardware repair needed.

❓ Frequently Asked Questions

Why does my Android say Call Failed every time?

“Call Failed” most commonly means the phone lost network registration, Call Barring is enabled, or VoLTE is disabled on a carrier that requires it for voice calls. Start with: Airplane Mode toggle (re-registers with tower in 20 seconds), then Phone app → Settings → Supplementary Services → Call Barring (verify nothing is active), then Settings → Network & internet → SIM → VoLTE calls (enable). Over 80% of persistent “Call Failed” errors are resolved by one of these three steps.

Why can I text but not make calls on Android?

SMS texting works on LTE data channels. Voice calls require either VoLTE (voice over the LTE data network) or a 2G/3G voice channel. If your carrier has shut down 2G/3G (most have by 2026) and VoLTE is disabled on your phone, texting works via LTE data but calls fail. Fix: Settings → Network & internet → SIM cards → enable VoLTE calls. Also check Call Barring — it blocks calls while leaving SMS unaffected.

What does VoLTE mean and why does it affect calls?

VoLTE stands for Voice over LTE — it routes phone calls over the 4G LTE data network instead of a dedicated 2G/3G voice channel. Most carriers have shut down 2G/3G by 2025–2026, making VoLTE the only supported call path. Without VoLTE enabled, the phone tries to fall back to non-existent 2G/3G and returns “Call Failed”. Enable it in Settings → Network & internet → SIM cards → your SIM → VoLTE calls. If the toggle is greyed out, contact your carrier to provision it.

Will reinserting my SIM card delete anything?

No — removing and reinserting a SIM card does not delete any data on the phone. Photos, apps, messages, and contacts stored on the phone are completely unaffected. Contacts stored on the SIM itself remain on the SIM. Always power off the phone before removing the SIM to avoid any risk of SIM corruption during removal.

How do I know if Call Barring is on?

Phone app → three-dot menu → Settings → Supplementary Services → Call Barring. On Samsung: Settings → Call Settings → More Settings → Call Barring. If any barring type shows as Active or Enabled, it is blocking calls. To disable: tap it → enter barring password (default 0000 or 1234) → Disable All. If the default password does not work, contact your carrier to disable barring remotely.

💬 Which fix restored calls on your Android? Leave a comment with your phone model and carrier. The VoLTE fix (Fix 4) now resolves the majority of call failures as carriers shut down 3G networks — if enabling VoLTE fixed your phone, share which carrier you are on. Still getting “Call Failed” after all 7 fixes? Tell me whether you can make calls on a different SIM — that single test determines whether it is a phone hardware issue or account/carrier issue.