One Puls 9解锁网络

If you're a Tmobile USA customer and meet the requirements you can try connecting to wifi and unlocking it.

Tmobile now automatically unlocks your phone once the requirements are met if you're a Tmobile USA customer.

Thanks for the reply

I have contacted customer service to unlock and tried the Wifi connection T-Moblie server to complete the final unlock, but it was unsuccessful and the connection server error code 255 was displayed. Twitter customer service said that it can only send the mobile phone back to the United States to complete the unlocking.

Since my T-Moblie SIM card does not roam internationally, WIfi does not support one puls 9 online unlocking.

Since it's an android you should be able to request a temporary unlock up to 5 times a rear.

gramps28 wrote:

由于它是一个机器人，您应该能够请求临时解锁最多 5 次。

Unable to connect to the T-Moblie server, so any unlocking method is unsuccessful. The only thing that can be done is to bring the phone back to the United States

Check YouTube. There's videos on how to unlock Android phones. Worth a shot before you send it in.