Smartphone unable to switch between mobile networks
4.5
The phone gets stuck on 2G/3G and won't move to 4G/5G.
Symptoms
- Stuck on "E" or "H"
- No 5G even in coverage
- Manual search fails
Possible Causes
- Network mode locked
- Old SIM card
- Software bug
Step-by-Step Fix
1
Set Preferred Network
Ensure "5G/LTE/3G/2G (auto connect)" is selected.
2
Update SIM Card
Older SIMs may not support newer 5G network bands.
3
Reset Modem
Use a dialer code (e.g., *#*#4636#*#*) to refresh the radio.
When to See a Technician
If the phone is stuck on 2G/3G, the carrier may be performing maintenance on local 4G/5G towers.
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