I resell the Exetel 3G service which is wholesaled from Optus on the 900mhz or 2100mhz range and have set up a number of voip clients over 3G.
It really is dependant on your location, cell tower load, latency etc etc. For some it works really well, but for others it doesn't.
Have you already got your 3G service? If so what kind of speeds down and up are you getting and are the speeds fairly consistant?
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