Signal issues

[Lanny1990]

Phone signal not working properly. Saying I have 4g etc and full bar but then telling me I have no Internet connection or not registered on network. Struggling to connect calls. I have reset phone settings, manual apn, reset connections, master reset phone still not working. I put  a sky sim in and it worked no problem. 

Any suggestions? Feel like my contract should be cancelled so I cam move on as I am not getting service I am paying for 

[Cleoriff]

@Lanny1990 

Are any of these helpful?

Guide: How can I sort out my network issues? 

Guide: Is the network down for me or everyone? 

Guide: Do you have poor coverage / signal Indoors? This may help Explain / resolve it 

[Enlli]

If you put a Sky SIM in and it worked then it's not a network fault.

Could well be a SIM problem. 

Call into an O2 shop with photo ID and get it swapped. Or if your phone does ESIM then do a SIM swap via my O2