I'm a T mobile customer how do i unlock a metro pcs phone to use on my t mobile account?

you’ll need to contact Metro.. if this was purchased as a used phone then the original owner will need to have it unlocked..as long as it meets all their requirements for the Metro side.

TMO owns metro..there was no merger..same as in here Metro will have certain requirements that must be met in order to unlock it..you paid who $70 for each phone?

who did you pay $70 each to for these phones? TMO? Metro? someone from ebay?

ok so not from TMO...or Metro for that matter..purchasing TMO/Metro devices NOT from either of them means you must meet the criteria required from both in order to unlock them..the fact that you purchased them from someone else means nothing..the requirements must be met.

Device eligibility is determined as follows:

• The device must be sold by T-Mobile.
• The device must not be reported as lost, stolen or blocked.
• The account associated with the device must be in good standing.
• The device must also satisfy all the Postpaid or Prepaid unlocking requirements outlined below.

Unlock eligibility for mobile devices on Postpaid plans

• The device must have been active on the T‑Mobile network for at least 40 days on the requesting line.
• If the device was financed or leased through T‑Mobile then all payments must be satisfied and the device must be paid in full.
• If the device is associated with a canceled account, then the account balance must be zero.
• T‑Mobile may request proof of purchase or additional information in its discretion and certain other exceptions may apply.

Unlock eligibility for mobile devices on Prepaid plans

• At least  365 days  must have passed since the device was activated on the T Mobile network.
• If the device was activated less than 365 days ago, then the   Prepaid account associated with the device must have had more than $100 in refills during that period for each line active on the account.  In   addition, more than 14 days must have passed since the device was purchased.
• No more than 2 mobile device unlocks have been complete per line of service in the last 12 months.
• T‑Mobile may request proof of purchase or additional information in its discretion and certain other exceptions may apply.

https://www.t-mobile.com/responsibility/consumer-info/policies/sim-unlock-policy

and this is just for TMO..not even the requirements for the Metro side.