connecting to mobile network may incur extrea charges depeding on your data continu samsuns s3 

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Auto Switch Between Wi-Fi & Mobile Data Networks - Samsung Galaxy S III mini

Turn Your Samsung Galaxy S5 Into a WiFi Hotspot and Share Your Internet Wirelessly disappearing as carriers try to extract more money from consumers. Most of the time, I reach my data limit on my samsung galaxy s2 before the start of next billing cycle. I try to avoid that extra monthly fee just for using internet for couple of days. Also, you might to turn it off other reasons like when you are testing WiFi connection etc though you need not to.

• Turn off the device.
• Press and hold the following three buttons at the same time: Volume Up key, Home key, Power key.
• When the phone vibrates, release the Power key but continue to press and hold the Volume Up key and the Home key.
• When the Android System Recovery screen appears, release the Volume Up and Home keys.
• Press the Volume down key to highlight ‘wipe data / factory reset.’
• Press Power button to select.
• Press the Volume down key to highlight ‘delete all user data.’
• Press Power button to select and start the master reset. When the master reset is complete, ‘Reboot system now’ is highlighted.
• Press the Power key to turn the restart the device

  Samsung Galaxy S3 not getting notifications for pending app updates when not connected to Wi-Fi