Phone Free Wallpapers

其他幾個國家再其次初期到80年代中期。

These first-generation (1G) systems could support far more simultaneous calls, but still used analog technology.

In 1991, the second-generation (2G) digital cellular technology was launched in Finland by Radiolinja on the GSM standard.

This sparked competition in the sector as the new operators challenged the incumbent 1G network operators.

This was followed by 3.5G, 3G+ or turbo 3G enhancements based on the high-speed packet access (HSPA) family, allowing UMTS networks to have higher data transfer speeds and capacity.