I've done that with T-Mobile on occasion.

<lahrens@gmail.com> wrote in message
news:1149804277.306591.302180@i40g2000cwc.googlegr oups.com...
>I am currently in a two year contract but I want a new phone. Can I buy
> a "Go" phone and put my current SIM in that phone and continue using my
> current plan?
>