You should be able to run the device is GSM mode - or Global if you have to... That will bring up the option to edit the APN for data, which you set to your carrier's info. It should run off the 2G/3G/3.5G data connection of your carrier if they are running the 850/1900 bands.
Check with your carrier and post the frequencies they use in order to help get this nailed down a bit more for you.
Hey mate, thanks so much for your reply.
2G
2G, other wise known as GSM, is standard on almost all phones (except CDMA phones in the USA). Most new phones come with quad band GSM support. A quad band GSM phone supports 850, 900, 1800, and 1900MHz.
2G is old technology and provides a fall back position when 3G coverage is unavailable.
Australian 2G bands:
900Mhz – Telstra, Optus & Vodafone
1800Mhz (Telstra, Optus & Vodafone all use this band for 4G instead)
Telstra plan to switch off all 2G-900 by end of 2016 to make the spectrum available for 4G.
3G
There are several 3G networks operating in Australia. 3G frequencies are usually specified as UMTS/HSDPA or WCDMA frequencies on the mobile phone specifications.
Australian 3G bands:
850MHz (B5) – Telstra, Vodafone
900MHz (B8) – Optus, Vodafone – available in most metro areas on Optus, with both Optus and Vodafone re-farming the 2G 900 spectrum in regional and rural areas
2100MHz (B1) – Telstra, Optus, Vodafone
4G
Australia is currently using these LTE bands (LTE bandmask in brackets):
2100Mhz (B1) FDD (0000000000000001) – Telstra (a handful of sites), Optus (Tasmania)
1800Mhz (B3) FDD (0000000000000004) – Telstra, Optus, Vodafone
900Mhz (B8) FDD (0000000000000080) – Telstra (a handful of sites, utilises spectrum previously used by 2G)
2300Mhz (B40) TDD (0000008000000000) – Optus (Vivid wireless spectrum)
700Mhz (B28) FDD (0000000008000000) – Telstra, Optus (switched on early in a couple of cities, will be widespread in 2015)
850Mhz (B5) FDD (000000??????????) – Vodafone (refarming 5Mhz of 3G to 4G across all metro areas by end of 2014)
To follow late 2014:
2600Mhz (B7) FDD (0000000000000040) – Telstra, Optus, TPG?
here is the page with my carrier details (Optus), I think it's supported by the device. But anything is, I have read quite a few post saying that verizon is super slow in delivering updates. So is that possible for me to jump on the developer preview wagon and totally get rid of this update issue? I assume I can get latest and frequent update ( I don't mind bug/ stability issue). And, in developer preview, is it Lumia privilege? or all devices are the same.