Great Links to help determine 3g/4g Capacities and modules you need to buy (Australia Only)

http://whirlpool.net.au/wiki/mobile_phone_frequencies

http://www.cisco.com/c/en/us/td/docs/routers/access/interfaces/software/feature/guide/EHWIC-4G-LTESW.html#wp1295826

These two links will tell you what module to buy depending on which provider and what 3g/4g coverage is available.