THIS METHOD IS TESTED ONLY FOR TALK AND TEXT SIM PROCEDURE. 1. GO TO SETTINGS 2. MOBILE NETWORKS 3. NETWORK MODE 4. UNDER NETWORK MODE - Default "LTE/3G/2G (Auto Connect) Now here's the trick... 1. Network mode option 2. Change to 2G 3. Change again to "LTE/3G/2G (Auto Connect)" 4. Now check...