iOS开发，最新判断是否是手机号的正则表达式

最近项目里需要判断是否为手机号并发送验证码的功能，一下是实现方法。不过这个方法还是有些不足，只能判断输入的11位数的号段是否正确，无法判断手机号是否存在。不过勉强可以使用！

+ (NSString *)valiMobile:(NSString *)mobile{
    if (mobile.length < 11)
    {
        return @"手机号长度只能是11位";
    }else{
        
            NSString *CM_NUM = @"^((13[4-9])|(147)|(15[0-2,7-9])|(178)|(18[2-4,7-8]))\\d{8}|(1705)\\d{7}$";
        
        NSString *CU_NUM = @"^((13[0-2])|(145)|(15[5-6])|(176)|(18[5,6]))\\d{8}|(1709)\\d{7}$";
        
        NSString *CT_NUM = @"^((133)|(153)|(177)|(18[0,1,9]))\\d{8}$";
        NSPredicate *pred1 = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", CM_NUM];
        BOOL isMatch1 = [pred1 evaluateWithObject:mobile];
        NSPredicate *pred2 = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", CU_NUM];
        BOOL isMatch2 = [pred2 evaluateWithObject:mobile];
        NSPredicate *pred3 = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", CT_NUM];
        BOOL isMatch3 = [pred3 evaluateWithObject:mobile];
        
        if (isMatch1 || isMatch2 || isMatch3) {
            return nil;
        }else{
            return @"请输入正确的*****号码";
        }
    }
    return nil;
}