Not clear your meaning. Are you referring to the mobile phone being used during 2FA auth flows? In this case, the authorization is not to a device but rather to

Not clear your meaning. Are you referring to the mobile phone being used during 2FA auth flows? In this case, the authorization is not to a device but rather to a number on the cellular network. You can swap devices without your bank knowing and without disrupting your authorization. Are you referring to mobile banking apps? If so, again, the bank is not authorizing an individual device. The authorization is a sign in session on the app. You can swap phones and download the app very easily without contacting the bank. > It's not enough to buy a new phone. You need to contact every single service that's bound to the lost/stolen/broken phone and authorize the new one before you can use their services. Are you referring to changing phone numbers maybe? If so, that is a totally different topic from OP and also from my comments.