iCloud account locked for security reasons I've been having troubles with my iCloud account on my iPhone lately and it recently became really annoying in the sense that i can't do basic things such as updating apps.

Basically i have been told that due to security reasons i had to verify my account. Following that procedure i was given a security phone number entry to get some sort of key to reinitialize my account's password. Here's the twist though : I no longer have that phone number and I don't have any sort of key recovery either. Ultimately i just thought of logging out of the iCloud account - side question here, can anybody tell me what kind of data I exactly lose when I log off the iCloud session on the iphone ? - but then i realised that to logg OFF the account i had to logg IN that same account I do not have the logs of. Am I doing something wrong or is this kind of an irrelevant way to deal with people who lost their logs ?

Thank you for reading/helping out.
It looks like you have to work with Apple to recover your account. Start here and when you get to the two-factor authentication steps, there will be a button with text along the line of "I don't have access to my authentication device" and by clicking this you can start a process which will allow Apple to manually verify your identity and restore control of the account to you.