How can I delete net work software from my mobile?

[lutwani]

I recently bought a ZTE F850 which is a phone used in Australia on their Telstra network. I would like to remove the Telstra software. I lve in Swaziland and the phone was an import job. We use MTN in SD and the Telstra software is not compatable here. The phone is 3G rated with video calling SMS MMS GPRS etc I'd like to keep this and although Mtn say they can read the phone on their system they can not log it in ( what ever that means) It may have something to do with phone being blocked to other service providers (don't know) can any body HELP???

[big_feet_big_shoes]

you will need to have the phone "flashed" this is like a format, it will wipe off the firmware or os, and install a new one.
it's not a hard thing to do, but if you dont know how you should really take it to a repair shop and have them do it.
you'll need the data cable, new firmware, and a flashing suite to do it.
if you have a look at the telstra website, sometimes it will have firmware updates, it's a long shot but have a look.