Hi there! I understand that you experienced an issue with the Number Shield app locking up after adding an area code, then after deleting and reinstalling it, the app still wouldn't work. I'd like to help you get this resolved.

To start, could you please tell me a bit more? For example:
- When you say "locked up," did the app freeze or crash? Or did it become unresponsive in some other way?
- After reinstalling, do you see any error messages? Or does it fail to open altogether?
- Have you tried adding the area code again, or is the app not letting you add anything now?

Meanwhile, here’s a step-by-step approach we can try based on your iPad’s iOS version (18.7.1):

1. Force close the app: Double-click the Home button (or swipe up from the bottom if your iPad has no Home button), find Number Shield, and swipe it up to close. Then reopen it.

2. Restart your iPad: Hold the power button and slide to power off, then turn it back on. This can often clear temporary issues.

3. Check app permissions: Go to Settings > Number Shield and ensure it has the necessary permissions, like Contacts or Phone (if applicable).

4. Ensure Network access: Number Shield may need internet access. Confirm your Wi-Fi or cellular connection is active.

5. Reinstall carefully: Now, delete Number Shield again. Restart your iPad. Then reinstall the latest version from the App Store to make sure you have the newest bug fixes.

6. Try adding area code again: When you add the area code this time, please do it one step at a time and see if the app behaves normally.

If after these steps the app still doesn't work properly or freezes, there might be a known bug related to adding area codes. According to some user reports, blocking numbers by area code can sometimes cause issues, but developers typically release fixes6.

Please try these steps and let me know how it goes! If the problem continues, I can help look into more advanced solutions or contact the app support on your behalf.

Are you able to try these now?