[Q] Not paying a 2nd month?

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http://forum.xda-developers.com – I'm travelling to Africa in a while, with a long stay. Will ATT block my IMEI if I didn't pay for a couple of months or just the sim? If they do block the IMEI, will I not be able to use the phone with the African SIM provider after unlocking the phone? Is it the same for all sim providers in the US? (HowTos)