[GT-S6102] Why SIM 2 is offline when SIM 1 is receiving a call?

To start with, GT-S6102 is a dual standby Duos phone and it is normal for the 2nd SIM to go offline while having a call on the 1st SIM (vise versa).

 

However; during the call, the SIM recieving a call can recieve waiting calls and thus we can do some call forwarding options to transfer the call from the offlined SIM 2 to online SIM 1.

 

Please follow the steps below to apply Call Forwarding Service on the device:

 

1. Go to Setting->SIM card Manager ->Dual SIM always on.

 

 

 

 

2. Input SIM 1 and SIM 2 mobile numbers.

 

 

3. Choose Both SIM Cards

 

 

 

 

4. Confirm by selecting OK

 

 

 

Now you can recieve any incoming calls whether the other SIM card is offline.