Why does my iphone 4s use so much mobile data?

With my old blackberry i would never use over 100mb a month, now i have a iphone 4s i haves used nearmy 500mb in 5 days, why is this? How can i use less? (and yes i already use ovano)

What are your essential Apps?

I'm looking to purchase some more Apps… Things that are handy to have, maybe some good games, along those lines. Though I've had my iTunes account, and iPod/iPhone for a long time, I haven't actually got many apps that I use. Has anyone got some good recommendations?

Is LTE classed as 4G or something else?

I got my new EE sim card today for my iPhone 5 and i was getting 3G but while i'm at work its saying LTE near my network symbol is that 4G or is it something else? I'm confused don't really understand it…

What causes the iPhone app switcher to lag?

I just bought an iPhone 5 and compared to my 2.5 year old 4 it's crazy fast. One thing I noticed was that double clicking the home and bring up the app switcher was instantaneous, and on the 4 it took 2-3 seconds. Although now my 5 is starting to do it. What causes it and is it fixable?

Cheap no contract plan for iphone 5?

I'm 15 and I'm starting to work this summer. It's only for 2 months though. Anyway, I want to start paying my own phone bill because my won't let me have an iphone 5 and she goes to my phone. She says she pays the bill, so she has all the right to go through my phone. I don't disagree with her but I also need my privacy. Also what are some cheap phone plans for me? I'm planning to buy an unlock iphone 5 from apple so I won't have a contract.