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I got a T-mobile sidekick from a freind of mine and everytime I put my t-mobile sim iin it always says that there is no sim. the Sidekick is unlocked and was working fine before my freind unlocked it.
My freind tried to sell it to someone else before the other person backed out
Try with some other network and if it does not work, I think the phone is not unlocked. I suggest you can approach unBBlock.com and specify the country,locked network of Sidekick LX.Based on the availability you can get the permanent unlock service along with free instructions.