Help Me , 4G option dissapear from my M3S

1397

6

2016-11-04 12:03

I lost my 4G option in my phone , and is set automatically to WCDMA prefered , sometimes I set my phone with *#*#4636#*#*  code and set connection to 4G but it comeback to WCDMA prefered, plesae help me master. sorry fo my bad english