Need help > weired problem > galaxy s6 (sm - g920fd/g920f) dual sim

[rony0505]

PROBLEM

Model: GALAXY S6 (SM - G920FD/G920F) DUAL SIM

SIM 1 > GSM ONLY > CALL, Message & Internet (Slow speed as 2G) without problem
SIM 2 > GSM ONLY > CALL, Message & Internet (Slow speed as 2G) without problem

IF CHOOSE

SIM 1 > LTE/WCDMA/GSM(Auto connect) OR WCDMA/GSM OR WCDMA ONLY > SHOW EMERGENCY CALL ONLY
SIM 2 > LTE/WCDMA/GSM(Auto connect) OR WCDMA/GSM OR WCDMA ONLY > SHOW EMERGENCY CALL ONLY

Is it the problem of dual Sim or what?

 

[B. Diddy]

Which carrier are you on? Perhaps your phone's cell radio is only compatible with the carrier's 2G GSM bands, and when you switch to the other mode, it's automatically trying to connect to 3G or 4G.

 

[Chawarwantm Tamrdn]

problem in mobile galaxy s6 g920f dual sim problem sim one not read please help me