Depending on the contract they do. Often enough it's the GSM modem paging someone for alarms that holds a SIM with some old corporate contract that has no flatr

Depending on the contract they do. Often enough it's the GSM modem paging someone for alarms that holds a SIM with some old corporate contract that has no flatrate. And you'd violate the contract if you exchange it for some private contract SIM with all inclusive SMS.