First, take a moment to protect your device in case it gets stolen or you leave it behind on a plane.
Turn on the screen lock setting and set a pass code. It is the easiest way to keep your information safe.
You should then download or activate any lost-device features.
Apple has "Find my iPhone." Android devices use the Android device manager.
Next, buy a case for your device. Broken and scratched devices can cost hundreds of dollars to fix.
And unless you want your new toy to be a drain on your finances, find a good way to monitor your usage.
Apple and Android devices allow you to track data usage, under settings. You can also install third-party apps to monitor usage.
Video and music streaming apps chew through tons of data, so make sure you are on a wireless network before you stream your favorite shows.