Get an iPhone if you jailbreak it as I found they are quite restricted. Android has a much more open market for apps however this does mean some are terrible. The z1 is a good phone but you might find it on the large side, however they are about to release the z1 compact which is the exact same phone spec wise (other than the screen) just smaller So Will Be A Similar Size TO an IPhone. Best thing to do is try one in the shop, you get a 7 or 14 day exchange policy on phones so can always try it out. Going from ios to andriod is bewildering to some so will take some getting used to but once you realise all the extra little bits you can do I think they're far superior. P.s And they have a back button... lol