Earlier generations of cellular systems were designed primarily for voice and limited data transmission in the form of short text messages.
1G refers to the first generation of wireless telephone technology, mobile telecommunications.
These are the analog telecommunications standards that were introduced in the 1980s and continued until being replaced by 2G digital telecommunications.
The main difference between two mobile telephone systems, 1G and 2G, is that the radio signals that 1G networks use are analog, while 2G networks are digital.