Follow these steps to resolve the issue of RoboKiller not opening on your iPhone 7.

1. Delete the RoboKiller app: Press and hold the app icon until the options appear. Select "Remove App," then confirm by tapping "Delete App."

2. Restart your iPhone: Press and hold the power button until you see the "slide to power off" slider. Slide it and wait for your iPhone to turn off completely. After it shuts down, press the power button again to turn it back on.

3. Check for iOS updates: Go to Settings, tap on General, then select Software Update. If there is an available update, download and install it to ensure your iPhone is running the latest version.

4. Reinstall the RoboKiller app: Open the App Store, search for “RoboKiller,” and tap the download icon to install it again.

5. Enable Call Blocking and Identification: After reinstalling, go to Settings > Phone > Call Blocking & Identification and ensure RoboKiller is toggled on.

6. Troubleshoot Call Forwarding: If RoboKiller still doesn't open, open the app, tap on More, then Help and Support, and select Troubleshoot call forwarding. Follow the prompts to resolve any setup issues.

7. Contact Support: If none of the above steps work, consider reaching out to RoboKiller's customer support for further assistance.

By following these instructions, you should be able to get RoboKiller functioning again on your iPhone 7. - learn more - learn more - learn more