Unlocking Atrix HD from AT&T for use on T-Mobile

[WaltF]

My daughter's Moto Atrix HD from AT&T will be off-contract this December and I would like to change carrier to T-Mobile (already have Unlocked phones for myself and wife).  How do I go about Unlocking my daughter's Atrix HD when the AT&T contract is up?

Do I contact AT&T or Motorola or T-Mobile to Unlock the phone?

Thanks

[Eagle328 · Accepted solution]

As soon as the contract is over reach out to AT&T to have them unlock your sim so you can go to T-Mobile.