O2 UK Network issues on S25 Ultra - Airplane mode to fix

Hellipsis — Wed, 14 Jan 2026 16:58:35 GMT

I am experiencing a persistent 'ghost signal' issue with my Samsung Galaxy S25 Ultra on the O2 network in the UK.

While the phone shows active signal bars, it frequently fails to register incoming calls (which go straight to voicemail without ringing) and cannot initiate outgoing calls.

This appears to be a network registration issue as the issue is only temporarily resolved by toggling Airplane Mode or restarting the device.

Any ideas?

Re: O2 UK Network issues on S25 Ultra - Airplane mode to fix

MI5 — Wed, 14 Jan 2026 17:09:34 GMT

@Hellipsis

Try a new sim. Pop in store with photo ID.

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O2 UK Network issues on S25 Ultra - Airplane mode to fix

Re: O2 UK Network issues on S25 Ultra - Airplane mode to fix