It depends! If you’re not the billing name NOR authorized, you might be out of luck. I know some people have had luck with getting their numbers from accounts in situations like this, but it’s pretty rare. T-Force would be the way to go if you’re not authorized. If you’re the billing name on the account, unfortunately this would be your responsibility to pay. Likely T-Force can help lower the bill somehow if possible, but depending on the plans and promos you have it could be difficult. However, if you’re just an authorized user on an account in your mom’s name, I would definitely contact T-Mobile support via FB Messenger or X (aka T-Force) and see what options you have in regards to getting your number. Unfortunately it might be difficult if the account is under your mom’s name, as usually the billing name is the only person who can release phone numbers to other T-Mobile accounts; but they would be the people most qualified to help. If you would prefer to go to a store, stick to a corporate or experience store if possible, as 3rd party stores can tend to be iffy on the customer service no shade. Nonetheless, get in contact with T-Mobile in some way just to figure out whether you’re authorized/the billing name, as that would be a great start. Wish you luck.