Representing the third and fourth generations of mobile technology respectively, 3G and 4G networks have many differences. Most notably, their rates of data transfer and signal quality are highly divergent. However, the implementation of 4G networks has faced many hurdles. Unlike 3G, 4G technology is not fully defined by governing bodies in charge of wireless technology.
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4G networks do not have a standard technology, minimizing the value of the label. Different carriers apply the term to three basic technologies; HSPA+ 21/42, WiMAX and LTE. However, the slow speed of some of these technologies make calling them a 4G technology disputable.
3G and 4G networks offer divergent levels of data transfer from sources to a device. In general, 3G networks enable 144Kbps minimum for Internet transfer speed. No specific standard exists for 4G networks.
The basic difference is that -- on the same network -- a 4G network is faster than a 3G network. However, compared across multiple carriers, one carrier's 3G may be significantly faster than another carrier's version of 4G.
Knowing What to Buy
When comparing 3G and 4G, compare data transmission speeds, not the label. AT&T's 3G, for example, is faster than MetroPCS' 4G LTE, according to tests run by PCMag.com.
When to Move to 4G
Upgrading to 4G requires a new phone. Before you make that upgrade, check the status of the 4G coverage in your area. In some situations, 3G is the best available, with 4G only in planning stages.