How to stop my iPhone from accessing the internet while I'm in the car?

I just got my first iPhone, and in the plan I get charged for using the internet when I'm not connected to Wi-Fi. To avoid getting billed extra, I shut off programs like facebook and snapchat while I'm in the car or whatever, but I'm still getting notifications, which must mean that my iPhone is still using the internet. How do I stop it from doing that? I don't want to pay extra.

Go to your settings and turn on airplane mode. That should keep it from going on the internet

If your running iOS 6 (other versions should be very similar)

Settings - general - cellular - cellular data (slide to off)

This will stop your phone from having access to Internet while not affecting any calling/texting features

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