Can a t mobile sim card be used in a at&t blackberry?

[rillzoh8]

i recently bought a blackberry curve on eBay, and realized its
carrier was At&t, while I use T-mobile, could I still use my
T-mobile SIM card with this?

 

[EmeliaM]

no the t-mobile card will be to big!
sorry

 

[tasteyy]

i recently bought a blackberry curve on eBay, and realized its
carrier was At&t, while I use T-mobile, could I still use my
T-mobile SIM card with this?

You need to Unlock Blackberry Phone from network lock to use with other GSM Network Sim card.You can get the unlock code from the site Simple Unlocking - Blackberry Supported Models and get the free Unlocking instructions at Mobileunlockguide.com Unlock Blackberry Curve from AT&T Network lock,then use with T-Mobile network sim card.