question: is the voicemail tied to the phone or the sim? i have an iphone 5 now and have some voicemail i want to save and keep. i upgraded to the 5S (backorder) using my other line's upgrade not mines. so when i swap sim when the 5S arrive, will the voicemails from my current iphone 5 stay or i'll lose it? is there a way i can save them at all? like a file or something to save?