You must meet the following criteria before T-Mobile will provide an unlock code, one of which is you need to be or have been a T-Mobile US customer. If you meet the requirements the instructions on how to request it are also included in the link.
I'm not a T-Mobile customer I bought this telefoque from a friend here in Brazil, but I need to unlock it
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If your friend was the T-Mobile customer and met requirements he would have
to do it.
T-Mobile will not unlock it if you don't meet the requirements one of which
is being a current or former customer.
Only other option but beware there are lot of scam ones, but look for third
party on the web to get it unlocked.
how do I do to be customers of you, and unlock the device
First this is a user support forum, we are customers but some of us have
been here helping for years and/or have been TMO customers for years in my
case going on 15.
If you are in Brazil there frankly is no way, since to meet the
requirements the phone would have to be on the network here for a minimum
of 40 days to qualify if you note the requirements. There is the prepaid
method with reloads but again if it doesn't hit the T-Mobile network they
will never unlock it.
can see the situation of this device there on T-mobile
Iphone 6 IMEI: 359232065259919
Not sure what you mean, they (T-Mobile) won't give you any information on
the previous owner or the phone since you aren't the registered purchaser.
Only the original T-Mobile customer who purchased it can request the unlock
if the device was paid off and met the requirements.
The only way someone who purchased it used and then used it as a T-Mobile
customer on the T-Mobile network meeting the requirements could probably
get it unlocked.
As for third party unlocking that is not a condoned practice so no carrier
will tell you to do it. I am a user not a T-Mobile employee and while I
will tell you that option is out there I won't provide you with a specific
one as just like the carriers won't be responsible if it goes bad.
Now outside of being locked there is also blacklisted and if your phone is
blacklisted even if you get it unlocked will not work period as all the
carriers share blacklisted IMEI numbers. You can check yours using the link