These code snippets will allow you to dial a number, send an SMS & send an e-mail from within your application. They will all open up the selected application and close yours.

Dialing a number

[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"tel://123456"]];

Sending an SMS

[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"sms:123456"]];

Sending an E-mail

[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"mailto:amasso@amasso.info?subject=Hello&body=Testing your code snippet."]];