- (BOOL)validateMobile:(NSString *)mobileNum
{
    NSString *regex = @"^1[3|5|7|8][0-9]\\d{8}$";
    NSPredicate *pred = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", regex];
    
    if(![pred evaluateWithObject:mobileNum])
    {
        return NO;
    }
    
    else
    {
        return YES;
    }
}