How Can We Know If A Text Message Fails?
Every once in a while, it happens that we send a text message that doesn't get delivered to the person we sent it to. So we better become aware of ...
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Sometime we need to turn off all device communications at once, like when we are in an airplane.
To do this, go to Settings > Wireless and networks, and check Airplane Mode.
You can also do this much easier via pressing and holding the power button and tap on the Airplane Mode button, if you have a Samsung Galaxy series smartphone (or tablet).
After that, all device communications, such as Bluetooth, WIFI, EDGE, Phone Calls ... are disabled.