While Long Term Evolution (LTE) is part of the GSM path, it will be the only cellular technology going forward. It has been introduced in data form by most carriers and in widespread use by Verizon. Voice over LTE (VoLTE) will eventually handle your voice calls as well.
Full Definition of CONDUCTIVITY. : the quality or power of conducting or transmitting: as a: the reciprocal of electrical resistivity b: the quality of living matter responsible for the transmission of and progressive reaction to stimuli.
An example of conductivity is heat transferring from hot pot of soup to a metal ladle sitting in the pot. 1  the property of conducting or transmitting heat, electricity, etc.  Elec. conductance per unit of area or volume, measured in siemens per meter: the reciprocal of resistivity.