How to implement number comparison like in the native iPhone contacts app?

I want to compare two numbers, like in case, for e.g. the number is 987654. It can be saved as +91 987654 or 0987654. But while searching or comparing, the number exactly matches and shows properly.

Right now I am using this code to compare the exact number. How do I enhance it?

// Remove non numeric characters from the phone number
phoneNumber = [[phoneNumber componentsSeparatedByCharactersInSet:[[NSCharacterSet alphanumericCharacterSet] invertedSet]] componentsJoinedByString:@""];

NSPredicate *predicate = [NSPredicate predicateWithBlock: ^(id record, NSDictionary *bindings) {
    ABMultiValueRef phoneNumbers = ABRecordCopyValue( (__bridge ABRecordRef)record, kABPersonPhoneProperty);
    BOOL result = NO;
    for (CFIndex i = 0; i < ABMultiValueGetCount(phoneNumbers); i++) {
        NSString *contactPhoneNumber = (__bridge_transfer NSString *) ABMultiValueCopyValueAtIndex(phoneNumbers, i);
        contactPhoneNumber = [[contactPhoneNumber componentsSeparatedByCharactersInSet:     [[NSCharacterSet alphanumericCharacterSet] invertedSet]] componentsJoinedByString:@""];
//Comparing the string are equal. phoneNumber is the number I am comparing to. 
        if ([contactPhoneNumber isEqualToString:phoneNumber])  {
            result = YES;
            break;
        }
    }
    CFRelease(phoneNumbers);
    return result;
}];

The above code results YES, only if the contactPhoneNumber and phoneNumber are exactly same. Not when 0987654 or +91 987654 with 987654.

The same thing works in WhatsApp number comparison too. Can anyone give any leads?