With a change of responsibility, account holders can let another person take ownership of an existing T-Mobile line or account. Only the current owner of an account can authorize an ownership transfer. It's a good idea for both parties to review the T-Mobile Terms & Conditions before the change of responsibility. Please note that you will only be able to move a number if it has been active on the current account for 90 days.

Consumer/postpaid line

• Contact us to begin the process.
• Both the new account owner and the existing account owner must call T-Mobile to authorize the change of account ownership.

Business line

This process is strictly for transfers involving at least one business line. 

• 21 lines or fewer: Print and sign the Business Change of Responsibility form (PDF best experienced with Adobe Acrobat Reader). Send the completed form to BusinessCare@T-MobileSupport.com or fax it to 1-877-214-5937.
  
• 22 or more lines: Contact Business Customer Service for help with transferring ownership.

Legal disclosures

1. You are responsible for all charges on your account until the accepting party customer completes the Change of Responsibility (COR). The account balance will not transfer to the accepting customer.
2. If the Change of Responsibility drops your account below the line amount for your rate plan, you will need to contact Customer Care to change your rate plan to a different plan once the Change of Responsibility is completed to avoid additional bills at the cost of the family rate plan.
3. If you have no active lines after the Change of Responsibility completes, your account will be cancelled. You will still have access to the T-Life app and My T-Mobile to settle your account and make your final payment.
4. Service promotions are not transferrable during a Change of Responsibility, not even for a deceased customer Change of Responsibility.
5. The accepting party may need to run credit and pay a deposit.
6. If you reside in the United States, the party assuming liability must be at least 18 years of age, and if you live in Puerto Rico, the party assuming liability must be at least 21 years of age.
7. After your portion of the Change of Responsibility is completed, the accepting party or parties will have 30 days to complete their portion of the Change of Responsibility.
8. Any future payments made via our automated system when calling Customer Service will be applied to the account of the party who has taken responsibility for the number(s).
9. Your voicemail box may be deleted, and all old messages may be lost, so make sure to save voicemails you want to keep.
10. Please complete any required equipment returns before transferring account responsibility. Once the Change of Responsibility is complete, devices can't be returned; however, exchanges for defective equipment can still be performed by the accepting party.
11. If you are transferring responsibility of a Home Internet Gateway, you will no longer be responsible for returning the Home Internet Gateway to T-Mobile. That responsibility will transfer to the accepting party taking over your service.
12. If you are transferring responsibility of a Home Internet Gateway, and the accepting party plans to use the home internet device at a different address, the accepting party’s address will need to be checked for eligibility.
13. If your account has AutoPay active, once the Change of Responsibility is complete, your final bill amount, including any EIP balance that is not transferred to the accepting party, will be deducted as normal about three days before the due date. If you’d like to update your AutoPay status, you can do so in the T-Life app.
14. If you have an Equipment Installment Plan associated with the transferred line(s), it will be transferred to the accepting party unless they are unable to or will not accept it. If they are unable to accept or will not accept the plan, you will remain responsible for all charges associated with the Equipment Installment Plan, per the terms and conditions of the Equipment Installment Plan agreement.
15. If you have any outstanding Equipment Installment Plan balance that is not transferred to the accepting party and your account is canceled, the Equipment Installment Plan balance will be charged IN FULL on your final bill.
16. Equipment Installment Plans are not eligible to be transferred within the first 90 days of beginning financing.
17. Equipment Installment Plans are limited to one change of ownership for the life of the account.
18. If you have a JUMP! On Demand lease, please note T-Mobile is unable to transfer JUMP! On Demand leases between accounts, and you will remain responsible for all charges associated with it per the terms and conditions of your lease agreement. If your account is canceled following the transfer, the remaining JUMP! monthly lease payments with applicable taxes will be charged to your final bill along with the purchase option price for the device. You can return the device within 30 days to have the purchase option price credited.
19. If you have Recurring Device Credit Promos from a Purchase and Trade-In, they can move to the accepting party account if you have an active Equipment Installment Plan that isn't paid off. You must transfer both the Equipment Installment Plan and your phone number to the accepting party account, which must be on an eligible plan. To keep getting the promo credits, you must keep the line of service, and the Equipment Installment Plan active. If either is canceled, the credits will stop.
20. If you have promos from a Purchase and Add-A-Line or Port-In, these will not transfer unless all conditions are met on the accepting party account. This includes moving the active Equipment Installment Plan and phone number to the accepting party account, and making sure the Port-In number moves too if needed. The Add-A-Line and Change of Responsibility number must move to the accepting party account to maintain the required line count. For example, if the promo requires a purchase, trade, and Add-A-Line, and the original account has two voice lines, both lines must move to the accepting party account, or you must move the line with the promo and add another line to meet the requirements.