What is the $7.29 charge for?

I was looking at doing a trade-in to get an iphone12 or even 13. My trade in is valued at $729.99 when getting the $729.99 iphone12 and valued at $799.99 applied to the iphone13.

24 monthly payments $7.29 $33.34 Monthly $0.00 Today + tax

If you cancel wireless service, remaining balance on device becomes due. For well qualified buyers. 0% APR. Qualifying service req'd.

1 offer appliedUp to $800 off with trade and new line. You're getting a promotion worth $799.99. You'll get a $175.00 (estimated) one-time bill credit for the value of your trade-in device, and the rest of the offer via 24 monthly bill credits.

So if $729.99 or $799.99 in total credits is being applied, why is there a $7.29 monthly charge for either phone?

I tried chatting with t-mobile and their response was to fill out a credit application before they would tell me their deep, dark promo secrets:

Unfortunately I can not give out any information more about our promotions until you've completed the secure forms. Joseph - 11:21 PM

You are just trying to force me into a sale. That just lost you a customer. Me - 11:23 PM

My sincerest if I am not meeting your expectations However, i can not give out information that we value dearly until you've gone through the prequalification forms.

If you're all set, we'll go ahead and say our goodbyes. Don't forget! We'll be right here if you need us again.

Joseph - 11:24 PM

Conversation closed by the agent - Now

Thanks for contacting us today. How would you rate your conversation with your T-Mobile Agent?

T-Mobile - 11:24 PM