I have friends who left Russia. We mostly communicate through WhatsApp. Lately they've been asking me to make local calls to their utilities companies or whatever because those companies only accept regular phone calls and obviously making a regular phone call from a foreign country would cost them a fortune. I'm getting tired of playing this game of broken phone, spending hours on hold and arguing with bureaucrats.

If there a way I could set my phone in a way that would allow them to connect to it with voice over ip and make local calls from my sim this way?