New answers tagged sim-unlocking
It depends. Is it factory SIM-unlocked, has it been unlocked through official channels, or has it been hack-unlocked? If it's either of the first two, you should be fine through any software updates. If it's been hacked unlocked though, I'd be careful of updates until someone confirms it working.
If your phone is running fine, then don't worry about it. It's possible that they unlocked your phone over-the-air... Sounds weird, but some companies do it with certain phones (for example, Sprint pushes out unlock codes over-the-air). Did you buy your phone outright from the carrier (the full price), or did you sign a contract?
You only need an unlock code if your phone was SIM-locked to start with. Not all phones are, and if you didn't get the phone from the carrier it definitely wasn't.
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