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how do you update your IMEI?

i heard that you have to update your IMEI with T-Mobile to get the Bug Fix Update. but i went to the tmobile store and they said they needed my old phone for some reason but i already sold it. then i called tmobile and they had no idea what i was talking about so what number am i supposed to call and what do i tell them specifically?
For the UK (at least) you can choose the phone from My-Tmobile, and also get settings sent to your phone - mms etc. It automatically can see you're IMEI (that you're sim is registered with right now).

For the US i dont know, but you can just say you got a behold 2 and I think you still have my old phone/serial number on my account.
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