Cool Mobile Wallpapers

这些第一代（1G）系统可以支持更同时通话。

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

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.

By 2009, it had become clear that, at some point, 3G networks would be overwhelmed by the growth of bandwidth-intensive applications, such as streaming media.