fjaviergjYou're observing a phone with dual standby like most phones out there. To be able to use both SIM simultaneously you need a phone with dual active. You can google it if you need to know more
I am observing a problem to be able to receive / send SMS messages on SIM 2 during a call on SIM 1. It is important to be able to receive messages while speaking for example for bank verification.
Do you know the problem?
Problems with SMS on SIM 2