Ask your bank and other to give you a different way for authentication. You will get a other tool for that. There are serval hardware-authenticators and other tools out there and each bank or service offers this to you.
Its yourself who create this single point of failure. I have a second (old) phone at home, ready for reactivation if needed. I am teaching my kids to not use the same Mailadress / mobile number for each service and to be sure to have a good backup for really important accounts (really important for my kid means: for Steam and other games).
Try to find different way to get the authentication. They exist. The only disadvantage is: you have to ask and it isn't as simple as an mobile.
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