Why is my email usage so high on my iPhone 4?

My iPhone email is using a LOT of my data. For example, I just switched to T-Mobile and after 1 day my usage is 120 MB with 106 of that being mail. I even have it set to not load images automatically and it is still very high. Any ideas? I do have 4 email accounts on it. WIth about 2 hours left in the day I've gotten 55 emails today.

How to deactivate/cancel a Walmart Family Mobile service?

I have a phone from Walmart that is on the Family Mobile plan and I'm planning on getting an iphone 4s. I know that the sim cards on the Walmart plans only use regular sims and the iphone 4s takes a micro, I have a cutter and am going to cut the sim card to fit. I'm also going to unlock the phone so that it isn't linked to any carrier and can be used with Walmart Family Mobile. My question though is, can I completely cancel the plan/service I have now? When I get this iphone I would like a completely clean slate, new number, sim card, everything. So is it possible to cancel the service I have and just get a whole new one with the same plan? Sort of like the plan I used to have never existed. I know this sounds kinda sketchy but I just want don't want the number I have now (because I get so many random texts/calls) and just want a fresh start.
Hope this makes at least some sense!
Sorry this is so long, just wanted to give as many details as possible!

How to clean my white plastic iPhone case? - 1

I bought an iPhone case online and it arrived a few days ago. It's a matte white plastic hard case. After a few days I've noticed that it's gone a bit pink/brown and is losing it's white colour. What is the best way to clean it? (preferably no strong chemicals, I've tried acetone polish remover and it started to wear down the plastic)

How to know how much storage on iphone?

Its unactivated due to icloud problems
i could sell for the parts but i don't know how much storage it has
even if i hook it up to my computer, itunes can't tell me until its activated.

Restoring a old but new to me iphone?

My iphone broke so my friend is letting me use his old iphone, i want to restore his iphone with my backed up content from itunes. When i plug in this phone to my computer it comes up (his name)'s iphone i want to be able to put my stuff on it though

How to hack an iphone 5 sprint?

How to hack an iphone 5 sprint?

Added (1). I have an iphone5 that sprint is the carrier of. I'm tired of them ripping me off. When they turn it off I will need to be able to turn the phone on and I have heard that you can hack these phones and still use them. It does not have a sim card.