The names say it all.
After the war between Alexander Graham Bell and Elisha Gray was over, the world became peaceful, and nothing major has happened for a long time (discounting the world wars). However, about a year after the World War II was over, a major event has occurred, namely the wireless and portable phone was made. The name of the device was profound, the Mobile Phone. By June 17th of 1946 Alton Dickenson and D. Mitchell spend decades working, inventing and perfecting what was to become the first wireless phone in the history of human kind. In only a year, this has become “the thing” and in one year the mobile telephone services (MTS) was installed in over a hundred cities worldwide. The Bell’s Laboratories yet again proved that they are unbeatable at the telephone business. Later, in early 1960’s, a new system, by a different company was created. Such a system positively screamed for a new, innovative name that will make people want to use it, and it was better then MTS too, so the obvious name for the system was named Improved Mobile Telephone Services (IMTS). In truth, the system was not much different from its predecessor, and while there were differences in the radio waves (thus the name, Radio Telephones) that they used to transfer information wirelessly, and that IMTS allowed one to actually dial numbers (quite the change, right?) but otherwise the differences were very minor. Both telephones, while being supposedly mobile, weighted over 20 pounds, and carried a strong current in them, so if you dropped one, you had better stand somewhere far away from the site. After IMTS, the world became peaceful again for some time, but little did we know, that the return of the telegraph idea (texting) was about to return.