Mobile phone features

GPS

Tells your your current location, this can give you the distance from your current location to a place you want to go. EG; to the train station.

WIFI

Wi-Fi is a popular technology that allows an electronic device to exchange data wirelessly (using radio waves) over a computer network,

BAND

You can have a single, dual, tri, or quad band. Each country has a band, and can only use it in the county thats got 'your band' if you have quad band you can use it everywhere you go. This would be useful

External Storage

You can back up your device, or give it to someone, to share photo's and files