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Could be the PUK (Pin UnlocK code) which your provider will have. Could be a handset restriction code ie, if you are putting another carriers sim in a phone that is 'locked' to a specific carrier. Again, provider will help you with this on;
OR, could be anything, we really need more info, what screen, what is it asking, what are the surrounding circumstances.
hello, hope these instructions help:
1. To expose the SIM card slot, peel back the bumper from the top-left edge of the device. (fig 1)
2. Insert the SIM into the slot with the gold contacts facing forward and the cut corner facing out. (fig 2)
3. When you release the SIM, make sure it is locked into position behind the catch so it will not spring out.
4. Replace the bumper and turn on the device.
Any problems, let me know :) Si