@Magda7
A quick search on this community, would have shown you the same topic that has been raised ad infinitum..
This is a customer to customer community, so no one can help with access to your account.
But a few things to try:
Login to https://mymobile.o2.co.uk via the web
Clear your app cache on the device
Uninstall the App, and then reinstall it
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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
