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