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Once the sim is entered into the phone and it connects to the network
the imei will register.
Go to your MyTmobile account and see if the imei is registered.
Hi, magenta4662557! Did you have a chance to read over gramps28's explanation of how this works? The IMEI is registered when an active SIM is inserted and used with the device -- sometimes it takes a few days (usually up to three) to show on our side, but our internal teams can check call data on postpaid accounts to see things more closely. How are things going for you?