Message sending problem

It sounds like you've tried various methods to re-establish contact with your old friend, but you're still unable to send messages to each other. Here are a few additional suggestions you could consider:

1. Make sure that you both have each other's correct phone numbers saved in your contacts. Sometimes, a small typo can lead to communication issues.
2. If you're using messaging apps like WhatsApp, Facebook Messenger, or others, ensure that you both have the correct profiles and that neither of you is experiencing any technical issues with the app.
3. Ensure that you and your friend are using the latest version of the third-party messaging app you're trying to use. Outdated apps can sometimes have compatibility issues.
4. If messaging continues to be problematic, consider reaching out through other means such as email, social media, or even a phone call.
5. If you have any mutual friends, you could ask them to act as intermediaries and help convey your message.
6. Sometimes, technical glitches can take time to resolve. If none of the above steps work, you might need to be patient and wait for a while before attempting communication again.
7. Sometimes, a simple restart can resolve temporary software glitches. Turn off your iPhone, wait for a few seconds, and then turn it back on.
   1. Restart the device. That's it.
   2. Still not solved --> Force restart iPhone - Apple Support
8. If the issue persists, you can try resetting all settings on your iPhone. This will not erase your data but will reset all personalized settings to their default values. Go to Settings > General > Transfer & Reset > Reset > Reset All Settings and confirm the action. Note that you will need to reconfigure your settings afterward. All settings—including network settings, the keyboard dictionary, the Home screen layout, location settings, privacy settings, and Apple Pay cards—are removed or reset to their defaults. No data or media are deleted.
   1. Reset All Settings: Return iPhone settings to their defaults - Apple Support:- Return iPhone settings to their defaults
   2. You can return settings to their defaults without erasing your content.
   3. If you want to save your settings, back up your iPhone before returning them to their defaults. For example, if you’re trying to solve a problem but returning settings to their defaults doesn’t help, you might want to restore your previous settings from a backup.
9. Make sure you have the latest updates installed.
   1. Update Over-the-Air (OTA) —> Update your iPhone or iPad - Apple Support (IN)
   2. Update using iTunes/Finder —> Update your iPhone, iPad, or iPod touch - Apple Support (IN)

If none of the above steps resolve the issue, it is recommended to reach out to Apple Support or visit an authorized service center for further assistance. They can provide specific guidance based on your device model and iOS version.