Adding another line on my T-Mobile account

[hwjchim]

SO I'm thinking of adding another line on my account for my brother..but..
Once I add him on, can he bring his phone in anytime and just upgrade to a higher end phone and just get billed later?
Or would I still be the only one that can make changes on the account only?

 

[Roze]

What carrier do you have? Different carriers have different policies.

 

[hwjchim]

I have tmobile.

 

[Frisco]

I have tmobile.

I moved your question to the T-Mobile forum, hwjchim, where other users of that carrier can chime in with an informed answer for you.