Well 

1. Have u updates the software to 6.0.1 if not try doing that it should it 
should solve  the issue 

2. Have u tried a hard restart for that you have to press home button and power 
button together till the phone shuts off ( do NOT slide to power off ) let it 
shut down on its own and restart it normally and try 


Sent from my  Neerajs iPhone 5 

On Nov 23, 2012, at 11:09 AM, Mohsina Yasmin <[email protected]> wrote:

> I'm in Bangalore . I've recently activated 3G on my iPhone 4S . Strange issue 
> occurred . 
> I cannot make voice calls when 3G network is on , the error shows as 'Call 
> failed' . 
> I have to turn off 3G every time I make calls . I did visit the Vodafone 
> store to get this checked , they replaced my sim n gave me a new one assuring 
> the issue would be solved , but the issue exists . Any way out folks ? 
> 
> 
> Sent from my iPhone 
> 
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