Hi there! I understand you're having trouble receiving the phone verification code on your iPhone 16 while trying to use the OpenTable app. Let's first make sure we get to the bottom of this together.

To start, could you tell me a bit more? For example:
- Are you not receiving any SMS messages at all, or just the verification code from OpenTable?
- Have you recently restarted your iPhone 16?
- Are you using the latest version of the OpenTable app and iOS?
- Do you have good cellular signal and can send/receive normal text messages?
- Have you checked that OpenTable isn’t blocked in your Messages app or in your iPhone settings?

Meanwhile, here are some initial steps you can take that often resolve verification code delivery issues on iPhone 16:

1. Restart your iPhone: This simple step can refresh network connections and resolve temporary glitches.
2. Check your Messages settings:
- Go to Settings > Messages and ensure Send as SMS is enabled.
3. Verify Phone Number and Carrier Service:
- Confirm your phone number is correctly entered on OpenTable.
- Ensure your carrier supports SMS and isn’t blocking short codes used by OpenTable.
4. Check for any Blocked Numbers or Filters:
- In Settings > Messages > Blocked Contacts, verify OpenTable’s sender number isn’t blocked.
5. Toggle Airplane Mode on and off:
- Swipe down from the top right and enable Airplane Mode for about 30 seconds, then disable it to reset connections.
6. Update your iOS and OpenTable app to the latest versions via the App Store and Settings > General > Software Update.
7. Force close and relaunch the OpenTable app.

If after these steps you are still not receiving the code, sometimes carriers or SMS gateways experience delays—restarting usually helps.

Does anything from these steps match what you’ve tried already? I can then guide you towards more specific troubleshooting based on your answers.