@Huh_u_existHave you tried the sim card in a different handset?
If you get the same issue I would recommend in the first instance getting a new sim card and seeing if this helps.
If you dont then it sounds like a faulty handset, so might be worth speaking to Huawei Support,
https://consumer.huawei.com/uk/support/warranty-query/o2 can be contacted on 202 or 0844 809 0202
when it comes to the reason you are calling, stay silent for 15 seconds and you will be taken to the keypad options.
Press 2 for Everything Else
Press 5 for More Options
Press 7 for Anything Else which will put you though to someone.
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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