This dual-sim device has two sim cards installed. One is configured and selected for phone calls and
SMS and the second sim card is used for data/internet connection (mobile data). In fact because of roaming the first sim card can not even work for mobile data.
The problem: When I get a phone call (sim1) the mobile data channel (sim2) does not work for the time of the call (mobile data in the top bar disappears).
I assumed that this would work without issues (parallel usage).
Most of the phones have only one modem even with two SIM slots. Those modems just switch between both SIMs, i.e. only one is active at a given time. While in a call the modem is bound to the SIM that received the call, i.e. the other SIM needs stay passive until the call terminates. So unless you have a phone with two modems you cannot use both SIMs concurrently
Yes. Even you may (and nowadays always will) have a dual SIM in standby -meaning you can receive calls on both cards- you cannot use bith SIMs simultaneously.
Okay, thanks. This makes absolutely sense and disappoints me at the same time. My scenario feels so common, especially when traveling. I don’t dare to ask; is there a phone on the market that provide two modems?