I have 2 Android phones. First phone is in country A. Of course it has an Internet connection over WiFi. Second phone is in another country B, as me. So, I need to make phone calls while I'm in country B (over Internet) remotely using the phone and its sim-card, which is in counrty A. What Android software do I need?
You can use some screen mirroring softwares like Airdroid or Mobizen for Samsung and make the calls from country B using your computer. But you need to configure it before hand. You can login from the same account in your mobile and computer so that you can access it even when they're in different networks