How to turn off push notifications on an iPhone?

I got an iPhone 4s, noticed that my credit went down a lot, like $50 in a day, and I have a feeling that it is the push notifications that are doing it. I've turned off cellular data, but I'd like too be able to check my email and stuff while out and about.So, how do I go about turning off push notifications?

Go to Settings>Mail, Contacts, Calendars>Fetch New Data (Push)> Turn push on but select Manually.
It will only check email when YOU want to.

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