how do i find out my sim number on t mobile

[yoloswa]

I dont no my sim card number and its on t-mobile.i have lost the card that has the number of the sim.but i dont.no my number and can u please help me asap thx
Can u give me a number so i can message tmobile to find out what is my number

 

[popatim]

not sure how you lose a sim card that you never take out of your phone but just go to your local Tmobile store and buy a new one. You dont need to know you old one. They will install the new one and program their system to allow the phone to function on their system. If your a good customer they wont even charge you for the $15 sim card.