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Solutions for no signal, data not working, WiFi calling, voicemail issues, and APN settings.
1. Restart your phone 2. Check airplane mode is off 3. Remove and reinsert SIM 4. Reset network settings
Full Signal Guide →Check mobile data is on. Go to Settings → Mobile Data → ensure it's enabled. Check you haven't exceeded your data limit.
iPhone: Settings → Phone → WiFi Calling. Android: Settings → Connections → WiFi Calling.
iPhone: Settings → General → Reset → Reset Network Settings. This fixes most connection issues.
If your technical problem isn't solved by these guides, contact O2 directly: