Hi I'm Kosuke I bought unlocked iphone 6s by Amazon.com and using T-mobile by Walmart $30 prepaid plan. Now I have gone back to Japan and I'd like to unlock it. While I was in US I visited T-mobile shop to unlock my iphone and they say I am eligible to unlock and the unlock code will be send in a few days. I received the e-mail today but my request was rejected as follows:
T-Mobile Sim Unlock Request
Sim Unlock Reference: 11999168
Thank you for taking the time to contact T-Mobile. We have received your Mobile Device Unlock request. Unfortunately, we are unable to process your request at this time because your device is associated with an Equipment Installment Plan that is not paid in full. Once the Equipment Installment Plan has been paid in full please contact us to have a new request submitted.
T-Mobile USA, Inc.
The device is associated with prepaid plan and it has fully paid. Actually I tried to unlock three times by Message, calling and visiting T-mobile office but neither one works. How can I unlock my iphone?
I bought the following iphone: