No, if you want to be able to use each satellite phone, each will need its own SIM card. Much like an unlocked cell phone, a satellite SIM card can be moved to another compatible phone, but to be able to make calls, each satellite phone will need its own SIM card with an active monthly plan or prepaid airtime. Iridium offers a few prepaid airtime options from 75-600 global satellite minutes to fit within any price budget and provide reliable satellite coverage! If your Iridium Global Prepaid SIM card expires, your airtime will be removed from the card and you will have a 270 day refill window to purchase a refill. Outside of that 270 day window, you will need to purchase a new SIM card and also receive a new number at the time you activate the new card.