sim unlock for non user

No carrier has the ability to unlock any phone in store; it can only be done over the phone by speaking to customer care.

Some android devices can be unlocked from the phone itself by using an unlock code however, iPhones specifically have to be unlocked by calling the original vendor and/ or the most recent phone service provider. 

Just give T-mobile’s customer service department a call and say “unlock my phone”, you’ll have to speak to representative, tell them you need your phone unlocked, they will need the IMEI of your device which can be found in your settings: click “general”, click “about”, scroll until you see “IMEI”. 
 

It takes a full 72 hours to unlock a phone. This same process is applicable to unlocking any phone at any company. 
 

If the phone was not paid off by the original owner and/ or has been reported lost or stolen, it will never be eligible to be unlocked. 

Please note that phones which were sold by any carrier initially, and have been paid off and previously unlocked but then taken to a new carrier can sometimes become locked to the new carriers network. An example of this scenario would be: T-Mobile selling the original device to the original owner, them paying off their phone and getting it unlocked, and then switching service to AT&T using their newly unlocked phone. AT&T automatically locks all phones to their network, despite not being the original vendor therefore, AT&T would be responsible to unlock it.
 

Companies that are known to automatically lock a phone with or without it being originally sold by them include AT&T, Spectrum Mobile, Boost Mobile, Cricket, Family Mobile, and Straight Talk to name a few.