Turn Data On / Off - Microsoft Lumia 735

To turn the mobile data for your smartphone on or off, follow these steps.
  1. From the Start screen, swipe left to display the apps list.
    Note Alternatively, tap All apps All apps icon (located in the lower-right, may require scrolling).
  2. Tap Settings Settings icon.
  3. Tap Network & wireless.
  4. Tap Cellular & SIM.
  5. Tap the Data connection switch to turn on Switch On icon or off Switch Off icon.

Note For more info on data usage and alerts, check out these Data Usage FAQs.