I Need Help With An Unlocked Tmobile Blackberry9700

My Cousin Just Recently Gave Me His Old Tmobile Blackberry And He Had It Unlocked So He Could Use His At&t Sim Card . Now That I Have It Im Trying To Use My Tmobile Sim Card In It And Im Not Getting Any Kind Of Reception Let Alone 3G . At Times I Might Get 3G For Like .... A Minute Or So Then It Will Go Back To At&t Or It Says That Theres No Mobile Connection Or Something.
Ive Tried Inputing The APN Settings For Tmobile Networks But , Thats Not Really Helpin Me Out Any. :( Please Help , It Would Be Greatly Appreciated !. (:

Will only work on 2G in manage connections.

Originally Posted by tatertashh92

My Cousin Just Recently Gave Me His Old Tmobile Blackberry And He Had It Unlocked So He Could Use His At&t Sim Card . Now That I Have It Im Trying To Use My Tmobile Sim Card In It And Im Not Getting Any Kind Of Reception Let Alone 3G . At Times I Might Get 3G For Like .... A Minute Or So Then It Will Go Back To At&t Or It Says That Theres No Mobile Connection Or Something. Ive Tried Inputing The APN Settings For Tmobile Networks But , Thats Not Really Helpin Me Out Any. :( Please Help , It Would Be Greatly Appreciated !. (:

It sounds like the phone still has routing for AT&T. Go to Host Routing Table (Options>Device>Advanced System Settings>Host Routing Table in OS6, it's similar on OS5, but I don't remember the exact sequence) and open the menu (BB Button on the left of the scroll pad). Select "Register Now" and get your tables updated.

Another thing: if you haven't already, you need a blackberry plan on your t-mo account.

Thanksss (: