@Jann33
You don't need your account number to use your sim, you just put the new sim in the device, and it should be already activated.
If you really want your account number it is in myo2, but you really only need your mobile number..
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iPhone 15 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
