My Iphone 4 keeps getting failed calls

Good morning.
I can´t get a single call to work on my iphone 4. There´s plenty of signal, but when I try to make a call, the call is terminated and the "Call failed" message is displayed.
Reading some of the forums online, I managed to make a call when I turn off my 3G network.
As soon I turn 3G back on, I can´t get a single call to work.
So, to sum up, I bought a really good looking phone that won´t work with 3G ?
And, by the way, I could use some work on my country´s website support, where it offers only the "Iphone Assistant".
Thank you.

Me too
other reports on the message board here
Help!!!

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