Move number to new SIM?


    I am a current T-Mobile prepaid customer.  I love my number and I have several elderly family members who would struggle to fix my number in their phones (etc.), so it's very important to me to keep it.  I just purchased a new phone and would like to transfer my number to the new SIM ahead of time (I currently have a micro and it will require a nano), so I got a new SIM "3-in-1" card.  How can I transfer my current number to the new SIM?  Going to "" just directs me to my account.  Any help would be very much appreciated.

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