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Network connection issues

Marta123
Level 1: Joiner
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Hi, I recently upgraded my phone to an OppoA54. Since then, I've had lots of issues with making or receiving phonecalls. I can't even get a ringtone and a message appears saying there are network issues although when I check connectivity on the area it tells me that everything is fine. Also, I can see all the bars on my phone. So far I have restarted the phone a million times, switched off G5, taken the SIM card out and placed it in a different slot, etc but nothing has worked. I am really frustrated now because I can't see a guru in my local store and when I contacted O2 all I received was a generic SMS saying they were sorry to hear about my issue! Can somebody please help me,? BTW, I can receive and send text messages, WhatsApps and use the internet. Thank you.

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MI5
Level 94: Supreme
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@Marta123 

Did you activate the 5g sim card or have you tried using your old 4g one?

Guide: Sim Swap: a mini guide 2017 update 

I have no affiliation whatsoever with O2 or any subsidiary companies. Comments posted are entirely of my own opinion. This is not Customer Service so we are unable to help with account specific issues.

Currently using:
OnePlus 6 (O2 & Sfr), Z3 Tablet (Three UK), iPhone 8+ (EE)
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