这是一段代码，它将给予您有关设备的所有信息

NSLog(@"uniqueIdentifier: %@", [[UIDevice currentDevice] uniqueIdentifier]);
    NSLog(@"name: %@", [[UIDevice currentDevice] name]);
    NSLog(@"systemName: %@", [[UIDevice currentDevice] systemName]);
    NSLog(@"systemVersion: %@", [[UIDevice currentDevice] systemVersion]);
    NSLog(@"model: %@", [[UIDevice currentDevice] model]);
    NSLog(@"localizedModel: %@", [[UIDevice currentDevice] localizedModel]);

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你可以在这里找到版本号。
但我会建议你去检查手机支持邮件 composer ，短信或不喜欢
System. out. println（@“System. out. println”）;

if (messageClass != nil) {          
    // Check whether the current device is configured for sending SMS messages
    if ([messageClass canSendText])
    {
        MFMessageComposeViewController *msgpicker = [[MFMessageComposeViewController alloc] init];
        msgpicker.messageComposeDelegate = self;
        msgpicker.recipients = [NSArray arrayWithObject:[self.productInfoArray valueForKey:@"Phone"]]; // your recipient number or self for testing
        msgpicker.body = @"test from OS4";
        NSLog(@"chat view array  %@",[self.productInfoArray valueForKey:@"Phone"]);
        [self presentModalViewController:msgpicker animated:YES];
        [msgpicker release];
        NSLog(@"SMS fired");

    }
    else {      NSLog(@"chat view array  %@",[self.productInfoArray valueForKey:@"Phone"]);
        NSLog(@"Device not configured to send SMS.") ;
        UIAlertView *alert= [[UIAlertView alloc]initWithTitle:@"Status" message:@"Device not configured to send SMS." delegate:self cancelButtonTitle:@"OK" otherButtonTitles:@"cancel",nil];
        [alert show];
        [alert release];

    }
}

型
这将有助于解决您的问题。快乐编码干杯。。

UIDevice类有一个systemVersion属性，你可以用它来获取操作系统的版本。这将返回版本值，比如3.1或4.2。我想你可以用它来确定对短信功能的访问。

@property (nonatomic, readonly, retain) NSString *systemVersion

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更多信息请查看参考资料> http://developer.apple.com/library/ios/#documentation/uikit/reference/UIDevice_Class/Reference/UIDevice.html

我想你可以用NSClassFromString(@"MFMessageComposeViewController")来看看这个类是否可用。
（警告：你不能用这种方式检查UIGestureRecognizer，因为Apple使用了同名的私有类。MFMessageComposeViewController也可能是这样。）