I recently bought an iPhone through my work, but since I quit my job and the sim card is locked to a certain business subscription, I have to pass my sim card to my work, though I keep my iPhone. What does the iPhone copy to the simcard? Do I have to wipe my iPhone before handing over the simcard? I hope not, but I wouldn't like if my private messages popped up for the new simcard user... I cannot find a "format sim card" option anywhere though.