One of the steps for overcoming alcoholism is getting the alcohol out of your house. Phone addiction is the same way, it definitely takes hard work and discipline on the part of the user, but there needs to be a way to get rid of your phone or at least the functionality that makes it addictive, without losing essential utility like keeping in contact with people, or in OP's case a mobile-only bank account
On desktop is much easier to do what OP is asking, a la network tricks mentioned in a sibling comment, editing your computer's hosts file, or other measures.
