first things first. how do we decide "a" if we need to do it and what do we need to know before we get the upgrade? >> obviously it will work on the new iphone 5s, 5s and the 5c coming out. if you have a 4, you might want to hold out and wait. a lot of times a new ios needs more power. if you don't have enough horsepower, you might end up with everything running slow. >> should you back up your device? >> absolutely. you should always back up everything. i installed it last night. and it took about an hour to get all my pictures back. i'm still having issues with my music. it started fresh. that experience may be different for other people. you definitely want to back up everything because you could