I'll try and update here...It;s true it cut the line ( stoppoing network ) . I just play around with below & you see if this apply on your phone function well .........
When Screen Off ( Entry task )
settings put global preferred_network_mode 1;
settings put global preferred_network_mode1 1;
( Exit task )
settings put global preferred_network_mode 9;
settings put global preferred_network_mode9 9;
- You see it skipped again the two command lines
- Exit task above is 2G/3G/4G
- Try to add a ** wait 8 seconds ** as the first line in exit task .
So that once the screen on you can quickly switch to CELLULAR SETTING PAGE on your phone to see if it is on 2G ansd you have 8 seconds to watching if it successfully switch from 2G to 2G/3G/4G
Hope works for you