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BlackBerry® Curve™

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Posts: 1
Registered: ‎10-15-2012
My Device: Curve 8900

Unlocked phone (T-Mobile) that when I install AT&T SIM....white screen fades in...

Hello all, I had an Atrix which took a dump - everything works except speaker, whether on speakerphone or regular...have an old Curve 8900 (through T-Mobile) that I just got unlocked, the phone went through whatever security patches after turned Wi-Fi on...I powered it down and then installed my current SIM (from AT&T) and it powers up but when you hit any key, it fades the screen to white and becomes inoperable. I pulled the battery anywhere from 15 mins to over 2 hours and it fades to white everytime.  I was able to receive a call but when the call ended and I tried to call out, fade to white.  Is this a safety feature or lockup feature from T-Mobile?? Thanks...