Here's how you can customize your cellular data application preferences on your iPhone 5.
1. Open the Settings app.
2. Tap on General.
3. Tap on Cellular.
4. Scroll down to the Use Cellular Data For section.
5. You can toggle any of the following settings on or off:
By carefully adjusting which applications you allow to use cellular data, you can cut down on your data usage and help save money by avoiding data overage charges.