Service

[Sc17]

I have recently switched my 02 sim to a Samsung s23 but I'm really struggling with signal. Phone is constantly showing no service or emergency calls only. Noone can get through to me? How can I fix this 

[jonsie]

Was your sim ok in your previous phone or is it a new sim?

Help threads here

Guide: How can I sort out my network issues? 

Guide: Is the network down for me or everyone? 

Guide: How to find help & contact O2 

If it's an old sim card get it changed at an O2 store but take photo ID

But first try your sim in another phone or another working sim in the S23

[madasaf1sh]

@Sc17 

I would in the first instance try a new sim and the best bet is to pop to your local o2 store with photo ID and they can do a sim swap. 

It might also be worth trying another o2 sim in your phone / your o2 sim in another phone. 

[MI5]

@jonsie 

In addition to the advice from @jonsie you can use this app to check and report any network issues https://www.o2.co.uk/apps/my-network