The possibility of doing something is one thing, implementing it another, but systems existed from 1988 that sent SMS messages to mobile phones usually messaging from one mobile phone to another mobile phone.Finnish Radiolinja became the first network to offer a commercial person-to-person SMS text messaging service in 1994.
The term originally referred to messages sent using the Short Message Service (SMS).
It has grown beyond alphanumeric text to include multimedia messages (known as MMS) containing digital images, videos, and sound content, as well as ideograms known as emoji (happy faces, sad faces, and other icons).
As of 2017, text messages are used by youth and adults for personal, family and social purposes and in business.
This was part of ISDN (Integrated Services Digital Network) and since GSM is based on this, made its way to the mobile phone.
Messages could be sent and received on ISDN phones, and these can send SMS to any GSM phone.