2 of 2 people found this helpful
If you want to send checks in the mail you will need to sign up for paper bills. T-mobile will include a envelope each month so that you can send out the check to them. Just remember though if you go this route you will lose out on the discount that you receive on newer plans when being set up for auto pay/paperless.
dragon1562 left some helpful information above. Were you able to make sure you signed up to get a paper bill? If so, you should receive a return envelope with the return mailing address already on it. Please let us know if you still need help.