Can I use a T mobile prepaid SIM in a Virgin phone?

I have a t-mobile prepaid cell phone, but I want to buy a new one.

Can I use the same SIM card in a Virgin, or AT&T, phone?

HI no you can't use your t-mobile sim in the phone which is locked to AT&T ,virgin and so on ..To fix this you have to unlock your phone from its present network provider ..You can easily unlock your phone using sites like Mobileunlocksolutions.com here they render unlock code for all mobile models at reliable cost ..After unlocking your phone you can freely use it with any GSM sim ...