Hello, I have a Samsung 21u mobile phone, not here before the transport signal has been good, after a period of time I found that the signal changed, My phone I can not use the sim card, this is too sad, I do not know what is the problem, can you help me unlock it? My device imei is 356544764096084. I would be very grateful.
Userlevel 7
+15
Are you a T-Mobile USA customer? Did you personally purchase the device directly from T-Mobile? Do you and your device meet all of the SIM Unlock Policy requirements that are required to qualify for a device SIM unlock?
SIM Unlock Policy | Unlock Your Mobile Wireless Device | T-Mobile
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