I try to avoid giving my cell number, precisely because it’s not secure, but also because it changes or I travel, and then I’m locked out of my own account.
Laughs in Bitcoin
Also, Charles Schwab Investment checking account for the uninitiated saves me from this issue; NFC enabled now ensures my card will never get eaten in a random ATM now.
It's hard to recall all services that have your phone number for migrating them, and even if you do, many won't accept a foreign number.
I've resorted to holding on to my old phone numbers by transferring them to prepaid SIMs.
I have the username, password and recovery email, but because I can't receive an SMS, I'm dead.