SOURCE: My samsung x 426 unlock
Maybe your phone is locked to AT&T. I've searched the net to find the unlock codes for my fone and it worked. Search for code calculators for SGH x426. The instruction is also included in their websites. It's fairly easy. Also, make sure that your sim is from the network provider in your country.
SOURCE: insert correct sim card
i you should try a software update, you can get this from www.sonyericsson.com/support. hope this helps
SOURCE: Sony Ericcsson w880i insert Correct Sim card Problem
u have soultion sonyeri w880i insert sim card
SOURCE: Sony Ericcson z300i - "Insert correct sim card"
hello, hearing your story I can only say that your was not unlocked or can't be unlocked depends if for example was it an offer?
Or they did not have the unlocking program for the phone
Try another repair shop
have a nice weekend
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