The major advantage to using WiMAX as a smart grid protocol is its status as an open platform.
GPRS
The General Packet Radio Service (GPRS) utilises the GSM mobile phone network to transmit data using IP packets. As a globally implemented standard, equipment can be deployed Worldwide with confidence.
Freestyle is communications network agnostic and has extensive experience with a wide range of technologies including custom manufacture of WiMax and GPRS devices