Millet 4 can't talk what to do

1, we will find that after the rice painting can not talk, and now we enter into the phone into the dial-up interface input *#* #4636 #*#* will automatically enter the test mode. As shown in the following figure

2, enter after we click to set the preferred network type Select LTE GSM CDMA, now we go into the wireless network open effect as shown in the following figure.

3, if not yet, click the image below Smsc Refresh, and then click Update, repeat the above steps.

We just click on the update or refresh.