The LTE Technoloogy of Japan is the same of any other LTE. In fact since LTE is still a "3G standard" (as defined by ITU on the IMT-2000) the term 3.9G is much more accurate than 4G. To be a "4G standard" the technology must serve 1Gbps in nomadic environments (as defined by ITU on the IMT-Advanced). Only LTE-Advanced and Wimax-m are candidates technologies to apply to IMT-Advanced and hence apply for a "4G" name.
“There's a certain feeling of wading through water with this phone, as every time we went exploring the menus, we were met with a delay long enough to make us doubt our keystrokes registered.”
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The LTE Technoloogy of Japan is the same of any other LTE. In fact since LTE is still a "3G standard" (as defined by ITU on the IMT-2000) the term 3.9G is much more accurate than 4G. To be a "4G standard" the technology must serve 1Gbps in nomadic environments (as defined by ITU on the IMT-Advanced). Only LTE-Advanced and Wimax-m are candidates technologies to apply to IMT-Advanced and hence apply for a "4G" name.