Mobile phones ( different things to different people. (to mean) the information about who uses them ( of great interest to the companies that produce them. (to be) one leading manufacturer ( customers into the following categories. (to divide) first, there are the ‘rational’ buyers who ( their phones for e-mail and internet access, as well as making calls. (to use) the second category, the so-called ‘stylish’, ( more attention to its style and appearance. (to pay)