BTW, since you're currently on iOS 6.1, it's quite a big update to go all the way to iOS 8.4. You should do the update through iTunes on your computer, not OTA. Also, the whole look of iOS has changed since you've last updated, be prepared for something that looks quite different.Ok thanks I will update
My experience has been somewhat different. I have been using iOS devices since the iPhone 4S was released and I've seen one crash, in iOS 7, and no problems at all with iOS 8.x thus far.iOS 8.3 is quite buggy so watch out.
iOS bugs tend to become less and less as the iOS 8 version goes through updates.iOS 8.3 is quite buggy so watch out.
iOS 8.3 is quite buggy so watch out.