About cellular data in iPhone 5?

If I turned off my cellular data and connect to our house wi-fi then I share photos in facebook (or twitter) through instagram? Will that increase my phone bill?

Please help me as this is my first time to use line.

Connecting trough your house wi-fi is better choice. Your phone bill will be way smaller than before.

Correct. Using your home Wi-Fi will stop cellular data usage. In fact if you use cellular data sparingly outside your home you might find you can limit usage to 200 MB or less/month. Watch your bills and see…

No need to manually turn off cellular data. After you have connected to your home Wi-Fi once, your phone will automatically turn off cellular data and automatically connect to your Wi-Fi in the future. And visa versa upon leaving your home. No actions on your part required, but if it makes you feel better, look at the indicators at the top of your screen to confirm.