If you are young, you probably can not appreciate just how cool this first hand-held portable phone was. Prior to this phone, portable phones were carried around in a bag, and a small handset was connected to talk on. It was a huge big deal to get to the point that the entire phone could be held in your hand. This phone was expensive, and minutes were prohibitively expensive, and we will not even talk about roaming charges.
Billing is getting much simpler for most cell phone companies, but many people have on occasion not understood the rules and have gotten huge phone bills. A guy I worked with got his son a phone, and the company advertised "Free Games". The games were free, but the airtime to play was not free, and he got his first month's bill, and it was $2,700. Have you ever gotten a nasty surprise on a cell phone bill?