@AleksandraO
A couple of things to do:
Try your sim card in a different phone
Check your local area for any service outages here https://status.o2.co.uk
Also have a look at these guides Guide: How can I sort out my network issues? Guide: Is the network down for me or everyone?
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iPhone 16 Pro Max - o2 and Spusu
Xperia 1V - Spusu
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This is not customer services and we dont have access to your account
I do not work for o2 or any VMo2 /Telefonica/Liberty Global Company
