iOS Phone No Validation

-(BOOL)checkValidation :(NSString *)phoneNo

{

    NSString *phoneRegex = @"((971)\\d{9})";

    NSPredicate *phoneTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", phoneRegex];

    

    BOOL phoneValidates = [phoneTest evaluateWithObject:phoneNo];

    return phoneValidates;

    

}