AT&T:
I was having a bad connection problem with AT&T and the tech suppoort guy told me that all of their cell phones should be powered off/on every day to insire a godd connection wiht my local cell tower.
He said by powering off/on that it clears the SIM of cell tower registration data, then the SIM has to re-reister with my nearest cell tower.
Apple
To make a long story short... The Apple Genius at my local store also said cycling the power keeps the phone running faster (like when a compuer or cable modem has been on a long time, like months) and it runs better when you shut it down for a few minutes and power everything back up.
I was having a bad connection problem with AT&T and the tech suppoort guy told me that all of their cell phones should be powered off/on every day to insire a godd connection wiht my local cell tower.
He said by powering off/on that it clears the SIM of cell tower registration data, then the SIM has to re-reister with my nearest cell tower.
Apple
To make a long story short... The Apple Genius at my local store also said cycling the power keeps the phone running faster (like when a compuer or cable modem has been on a long time, like months) and it runs better when you shut it down for a few minutes and power everything back up.