code for calling from iphone os 3.0 not working?
<pre><code>NSString *StrPhoneNo = @"(21) 2197-78797";

[[UIApplication sharedApplication] openURL:
      [NSURL URLWithString:[NSString stringWithFormat:@"tel:%@", StrPhoneNo]];
</code></pre>

<p>This is not working?</p>
