Need a system where I can put my physical SIM card into a serial convertor and it “plugs” into a phone located in some other country so it can ping elsewhere ev

Need a system where I can put my physical SIM card into a serial convertor and it “plugs” into a phone located in some other country so it can ping elsewhere every once in a while. Dunno if providers will pick up on me teleporting around. Maybe the better way is some kind of 700mhz repeater-over-IP.