What were the most significant changes in the world of mobile technology during the 1990s?

The 1990s was a decade of rapid change and innovation in the world of mobile technology. Some of the most significant changes during this period include:

• The development of 2G (second generation) cellular networks, which allowed for digital transmission of voice and data and paved the way for mobile internet.
• The introduction of flip phones, which were smaller and more portable than previous mobile phones.
• The first smartphone, IBM's Simon, was released in 1993. While not widely adopted, it laid the foundation for the modern smartphone.
• The launch of SMS (short message service) in 1992, which allowed users to send text messages between mobile devices.
• The beginning of mobile internet, with the introduction of Wireless Application Protocol (WAP) in 1999.
• The first mobile phone with an integrated camera, the J-SH04, was released in 2000 by Japanese company Sharp.

These changes in mobile technology during the 1990s paved the way for the modern era of smartphones, mobile internet, and the always-connected world we live in today.