Nokia 1011 mobile phone, manufactured by Nokia, Germany, 1992-1994. An example of the first mass produced phone to be available for use on the GSM digital mobile networks.
GSM stands for Global System for Mobile Communications (originally named after the committee that worked on it, Groups Spécial Mobile). GSM was a European standard for early digital mobile networks, meaning that mobile phone users could use their phones across the whole of Europe without having to buy a new handset in every country. A key feature of GSM was the Subscriber Identity Module, commonly known as a SIM card. The Nokia 1011 was the first mass produced GSM mobile phone, and worked in 14 countries when it was released.