T-Mobile Customer Service: a little slow (in the head)

You: I'm wondering if it's possible to use a prepaid phone on a contract plan

You: I broke my phone but my contract isn't up for a year and a half, so I'm looking for a replacement phone.

Tamara: Do you already have a phone?

You: yes I'm using my old phone but it's pretty old and doesn't work that well, which is why I'd like to replace it

Tamara: Do you want to replace your phone?

You: Yes, and I'm wondering if I could use a prepaid phone on my contract plan

Tamara: Do you already have a plan?

You: Yes

You: Can I use a prepaid phone on my plan?

Tamara: Is that phone is a t-mobile phone?

You: Yes

Tamara: Then you can use it.