My iPhone 3gs was locked to virgin but it was unlocked before i bought it and i now use a t-mobile sim card. If I update my phone to ios 5.1 will it lock my phone so I can no longer use it? I'm scared to update!! Please help

I updated my sisters phone yesterday to ios 5.1 but after I did this it wouldn't recognise her sim card and the phone isn't unlocked or jailbroken. My phone is unlocked but not jailbroken and I have done all the updates before without a problem. Does this mean that if I update to ios 5.1 it wont lock my phone and will continue to work as normal?

That depends on where it came from and how it was "unlocked". Virgin is a supported carrier in France and in Canada.
If you are in France, then it could have been legitimately unlocked. Virgin France offers unlocking.
If you are in Canada, then it was definitely hacked to unlock it as they do not offer unlocking there. If it is a Canadian phone, you can't be supported here at all. Discussing hacked and jailbroken phones is forbidden by the terms of service.

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