UPS lost my package, T-Mobile wont do anything about it

I ordered an iPhone that was supposed to be delivered Friday 09/20 but has been lost in ups warehouse and they can’t find it.

im upset since I pay for a service I can't enjoy without a working phone and unsure if they will find the new phone in transit or how to do about getting a new device back. I don't want to have to make a new order. I want T-Mobile to solve this since it is the partnership with ups that is causing this distress.