Photos taken on mobiles can be printed to very high quality - and there are lots of creative things you can produce with them. Just pop in to your nearby Snappy Snaps, here. http://goo.gl/Ur6jO
Tube Map Application on apple phone is really handy as it has a map and also updates and if there tube delays or closures. It also helps people find the best route from A to B.
Go first thing in the morning or just after 1.30-2PM if you want to get served quickly, otherwise it's a queue as dipsticks that don't know anything about phones ask banal questions to the Geek Squad!