a telecommunications service provider, strategically partnered with Comvik's international cellular operations to become Millicom International Cellular SA. The company went on to establish a 1G systems foothold in Ghana, Africa under the brand name Mobitel. In 2006, the company's Ghana operations were renamed to Tigo.

The wireless revolution began in the early 1990s, leading to the transition from analog to digital networks. The MOSFET invented