Telecom brand iPhone4 ios6. 1 system escaped from prison, but you can't send text messages. Everything else is normal. Please ask God for help.

You can refresh the system of 6. 1. Please follow the following steps:

Download the firmware of iPhone 4 iOS 6. 1 on the computer.

After the iPhone4 is activated, insert the telecom card and restart. After the signal search is completed, turn on the computer iTunes (to ensure that the computer can surf the Internet), connect the mobile phone, and then the mobile phone will display "No service", then dial *228 with the mobile phone, and don't hang up after seeing China Telecom.

Press the Shift key of the computer, click Update, and select the downloaded iOS 6. 1 firmware.

After the update is completed, the iPhone 4 can use the telecom card.

If you need to purchase a machine and check the phone bill, please log in to the online business hall (/). Hundreds of mobile phones are cheap all over the network, and now you can enjoy a 50% discount on the call charges to 2 yuan.