[pessimizer]

They won't find a solution to your problem, when one is obvious: buy a phone.

They'll find a solution to their problem, which is you: apologize for losing you as a customer, and express a hope that you'll consider them again after you've bought a phone.

[immibis]

There can be laws like the right to have a bank account, that might say your bank can't require you to have anything they don't provide you with for free. In some places.