A fews days ago I bought a phone from T-Mobile by telephone call. I got the phone yesterday. It is a no-contract phone but I want to use my current phone number and remain in my current postpaid account. My old phone's SIM is standard size and the new one is a micro so I can't use the old SIM in the new phone. My question is, can I use the SIM that came with the new phone and activate it using my old phone number and remain in my current postpaid plan? If so, can I use the on-line "Update SIM Card number" screen to do this or what do I need to do? Thank you.
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