[Q] Unlocked ATT device no signal after switching SIM - Motorola Atrix HD

Hello.
I have an Atrix HD from ATT, I bought it unlocked at Ebay. I used it with my ATT sim Card, then with Movistar in Colombia for vacations and everything was working great. Then I came back to the US, used a T-Mobile sim card and now I can not use any other sim card. The only one it accepts is the T-Mobile one and it works fine. If I pop any other sim card it gives me no signal (a white cross appears in a red circle where the circle bars should be).
My phone is rooted but I have not flashed any ROM or done anything else beyond installing Superuser and Titanium Backup. I already did an internal and an external reset and none works: The only sim card that gets signal is the T-Mobile one. Called T-Mobile and they said they cant help me since the phone is not supported.
My hint is that somehow the T-Mobile sim card switched my frequency bands. Whats funny though is that now I am in Colombia and when I insert the T-Mobile sim card and check which network is my phone connected to it shows Movistar and the signal bars are great. If I pop up my Movistar sim card it gets no signal at all.
Any help will be greatly appreaciated.

You must have setup the sim card lock disable that and then try putting in another sim
Sent from my MB886 using xda app-developers app

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kingkhan said:
Hello everywhere! I read online that the Moto G 2014 sold by Wind Mobile Canada comes unlocked, so just to test it out I put in a friend's Bell Sim card, which the phone detected right away. Now when I inserted my Wind Sim card back, it does not read it, there is a constant error on the lockscreen: "No Simcard- Emergency Calls only". I have tested my Wind Sim in my wife's Nexus and it works fine. Her Wind sim card, however, does not work in my phone either, but Bell/Fido etc work just fine.
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Click to expand...
Click to collapse
make sure the APN settings are correct
http://www.windmobile.ca/my-wind/faq/devices#79a34877-c3ee-6924-b2e4-ff0300f64c51

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gangsta101 said:
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Click to expand...
Click to collapse
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