Telcel (América Móvil) looks like the only game in town...

Thanks qtla9111

I'm looking into it. Seems a few years ago I couldn't install it on any of my phones, because the kick-back "PIN" or code they send to e-mail and/or phones (my land and mobiles) wouldn't arrive LOL

I'll have to attempt this again...

OK....looks like the phone calls can be made VoIP from any phone with an wi-fi capability (just about every phone on the market has wi-fi these days). So, no local "cell" SIM needed (IF one wishes to make IP calls only)....