Different Features...
Desciption;
On a mobile device they all have different features, some have just texting and call. Some have wifi, memory, camera ect. Many of the newer phones have more features. in the olden days they only had texting and calls. Nowadays you get plenty more features on different phones.
The Different Features;
-Roaming which permits the same phone to be used in a multiple countries providing that the operators of both countries have a roaming agreement. Send and recive data and faxes.