LTE technology operating in the 750 MHz radio frequency band.
Although commonly referred to at the 700 MHz band, the upper 700 MHz band used by Verizon Wireless in the US is separate and not compatible with the lower 700 MHz band used by AT&T Mobility in the US.
Therefore, and since it closer to 750 MHz anyway, Phone Scoop refers to the mode used by Verizon as "LTE 750", to distinguish it from the incompatible "LTE 700" used by AT&T.