No Service After UK 5G → 4G Switching

No Service After UK 5G → 4G Switching – iPhone & Samsung Fix

Understanding the Problem

Switching between 5G and 4G networks in the UK can occasionally cause “No Service” or “SIM Not Detected” errors on iPhones and Samsung devices. This typically happens in areas where 5G coverage is spotty or unstable, such as city outskirts, railway lines, or rural towns like Cornwall and Northumberland. The error is often triggered when the device fails to reconnect properly to 4G after dropping from 5G.

Common Symptoms

  • Device shows “No Service” immediately after switching networks.
  • Carrier name disappears or is replaced by “Searching…”.
  • Calls and mobile data stop working temporarily.
  • Restarting sometimes fixes the issue, but it may return with further network switches.

Step 1: Toggle Airplane Mode

A simple reset often resolves network handover errors:

  • Enable Airplane Mode for 15–20 seconds.
  • Disable it and allow the phone to reconnect to the network.

Observation: Users travelling between London and Reading found that this cleared temporary “No Service” errors when moving between 5G and 4G coverage zones.

Step 2: Verify SIM and Tray Alignment

Network switches can exacerbate minor SIM tray misalignments:

  1. Power off the device.
  2. Remove the SIM tray and check the SIM for dust, scratches, or bending.
  3. Reinsert carefully, ensuring a flush fit.

Step 3: Reset Network Settings

Network handovers sometimes corrupt configurations:

  • iPhone: Settings → General → Transfer or Reset iPhone → Reset → Reset Network Settings
  • Samsung: Settings → General Management → Reset → Reset Network Settings

Warning: This removes saved Wi-Fi networks and VPN settings. Many users in Glasgow and Leeds reported that this resolved persistent post-switch “No Service” errors.

Step 4: Update Software and Carrier Settings

Ensure your device is running the latest firmware and carrier profiles:

  • iPhone: Settings → General → Software Update and check Settings → General → About for carrier updates.
  • Samsung: Settings → Software Update → Download and Install, then check Settings → About Phone → Software Information.

Observation: Minor updates often address network transition bugs, preventing “No Service” after 5G → 4G switches.

Step 5: Manual Network Selection

Automatic handovers may fail during 5G → 4G transitions:

  • iPhone: Settings → Cellular → Network Selection → Disable Automatic → Choose Carrier
  • Samsung: Settings → Connections → Mobile Networks → Network Operators → Manual

Users in Sheffield found this immediately restored connectivity when the device repeatedly lost signal during network switching.

Step 6: Test With Another SIM

Confirm whether the issue lies with the SIM or device:

  • Try the SIM in another compatible device on the same network.
  • Insert a different SIM into your device.

Step 7: Carrier Support if Persistent

If errors persist:

  • Confirm the SIM is active and correctly provisioned.
  • Request a replacement SIM if necessary.
  • Ask about local 5G → 4G handover stability or coverage improvements.

Extra UK Tips

  • Travel routes with fluctuating 5G coverage, such as the M6 corridor, may trigger transient “No Service” errors.
  • Document your device, OS version, and operator when contacting support.
  • Wi-Fi calling can provide a temporary solution in areas with unstable 4G after dropping from 5G.

Conclusion

“No Service” errors after switching from 5G to 4G in the UK are typically a mix of network handover issues, minor SIM alignment problems, and outdated software or carrier settings. Stepwise troubleshooting—including Airplane Mode, network resets, carrier updates, and manual selection—resolves most cases. AvNexo recommends understanding local 5G/4G coverage patterns to avoid repeated signal losses and unnecessary device interventions.

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