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I would like to know how to unlock an s21 that I bought online and it is not unlocked
Could someone help me how to do it, the person who bought it from me does not answer me
if you purchased it online and it was never used on TMO they wont be able to unlock it..TMO have requirements that must be met.
https://www.t-mobile.com/responsibility/consumer-info/policies/sim-unlock-policy
if you purchased it from someone else advertised as unlocked then i would return it. safe to say it is not.
You would need to have the original owner request the SIM unlock through T-Mobile. Their account would need to meet all of the SIM Unlock Policy requirements for hte device and the account. You would also need their active T-Mobile SIM in the device for the SIM unlock to approve.
SIM Unlock Policy | Unlock Your Mobile Wireless Device | T-Mobile
You are more than likely better off returning the device to them for a refund.
