iPhone开发教程之短信，电话，邮件，提示框

+ (void)alert:(NSString *)msg
{
    UIAlertView *alertView = [[[UIAlertView alloc] initWithTitle:msg message:@"" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil] autorelease];
    [alertView showWithBackground];
}

+ (void) makeCall:(NSString *)phoneNumber
{
    if ([DeviceDetection isIPodTouch]){
        [UIUtils alert:kCallNotSupportOnIPod];
        return;
    }
   
    NSString* numberAfterClear = [UIUtils cleanPhoneNumber:phoneNumber];   
   
    NSURL *phoneNumberURL = [NSURL URLWithString:[NSString stringWithFormat:@"tel:%@", numberAfterClear]];
    //NSURL *phoneNumberURL = [NSURL URLWithString:[NSString stringWithFormat:@"atel:%@", numberAfterClear]];
    NSLog(@"make call, URL=%@", phoneNumberURL);
   
    [[UIApplication sharedApplication] openURL:phoneNumberURL];   
}

+ (void) sendSms:(NSString *)phoneNumber
{
    if ([DeviceDetection isIPodTouch]){
        [UIUtils alert:kSmsNotSupportOnIPod];
        return;
    }
   
    NSString* numberAfterClear = [UIUtils cleanPhoneNumber:phoneNumber];
   
    NSURL *phoneNumberURL = [NSURL URLWithString:[NSString stringWithFormat:@"sms:%@", numberAfterClear]];
    NSLog(@"send sms, URL=%@", phoneNumberURL);
    [[UIApplication sharedApplication] openURL:phoneNumberURL];   
}

+ (void) sendEmail:(NSString *)phoneNumber
{
    NSURL *phoneNumberURL = [NSURL URLWithString:[NSString stringWithFormat:@"mailto:%@", phoneNumber]];
    NSLog(@"send sms, URL=%@", phoneNumberURL);
    [[UIApplication sharedApplication] openURL:phoneNumberURL];   
}

+ (void) sendEmail:(NSString *)to cc:(NSString*)cc subject:(NSString*)subject body:(NSString*)body
{
    NSString* str = [NSString stringWithFormat:@"mailto:%@?cc=%@&subject=%@&body=%@",
                     to, cc, subject, body];

    str = [str stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
   
    [[UIApplication sharedApplication] openURL:[NSURL URLWithString:str]];
   
}

apple reference:

http://developer.apple.com/library/ios/#documentation/MessageUI/Reference/MFMailComposeViewController_class/Reference/Reference.html