1991 marked the first unveiling of the GSM technology our mobile phones evolved from. This technology has gone through a lot of changes and has lead to the more advanced LTE network we are now moving to use. Without GSM technology, mobile phones will not be possible and we wouldn't have anything to wake up to in the morning and smile at.
Nonetheless, celebrate this joyous day with the great possibilities it opened up for us. Twenty years ago opened the door for one of the most used technology in human history, so enjoy.

Via: IntoMobile