I switched mobile operator, which uses 900MHz WCDMA-3G and outside the city when I was using LTE and someone called me I was unreachable because it is not timely connect to 3G/2G. I can confirm that the modem from 2015-14.07 works, thank you @adilrenzu. I'm on AICP11.
Sent from JiayuS3A AICP11
Sent from JiayuS3A AICP11