Chinese android phone help rom

Hi im relatively new to rooting/flashing/roms and what not.

just wondering if anyone could help, Im from Australia and I have a phone that was imported from china.

the specs said 3G: WCDMA: 850/2100MHz so i assumed 3g would work although I can only get 2g working and have tried MANY networks on multiple frequencies.

my final option would be to maybe flash the phone? open to suggestions on what to do and if any of you think changing the operating system would do anything?

the phone was advertised as ..

4.5 Inch Quad Core Android 4.2 Phone "Chief" - 1.2GHz, Quad Core CPU, 8MP Rear Camera

Manufacturer Specifications:General
OS Version: 4.2
CPU: MTK6589
Processor Speed (max): 1.2GHz Quad Core
GPU: Power VR SGX531
RAM: 1GB
3G: WCDMA: 850/2100MHz
2G: GSM 850/900/1800/1900MHz
WiFi: 802.11 b/g/n
Bluetooth
Adobe Flash
Portable WiFi Hotspot (3G Tethering)
Google Play
8 Megapixel Rear Camera + 3 Megapixel Front-Facing Camera
Mic and Speaker
Battery Size: 2000mAH
Usage Time: 6 Hours
Battery Standby: 3 Days
Languages: Bahasa Indonesia, Bahasa Melayu, German, English, Spanish, French, Italian, Dutch, Portuguese, Vietnamese, Turkish, Russian, Persian, Arab, Hindi, Thai, Chinese (Simplified), Chinese (Traditional)
Display Size: 4.5 Inch
Display Resolution: 960x540 240PPI
5 Point Capacitive Multi Touch Display

any help would be much appreciated!

fry

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