HELP!! is it bricked?

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http://androidforums.com – hi i got a sony experia x10 off ebay, it was locked to t mobile, i got unlock soft where from phone fun shop. had a nightmare with that, so took it to a shop, got it un locked but now i get "Your SIM card does not allow a connection to this network" also, sim doesent contain any contacts i have tryed getting a new sim from 3 calling 3 to see if IMIE is black listed repairing with pc companion, unlocking/ relocking boot loader setting APNs manually, they just dissapere when i hit save could there be a problem with sim slot , or is it hard locked now due to a do (General)