Your iPhone 6s is experiencing multiple issues related to connectivity and updates, likely due to outdated software and potential certificate issues. Here's a step-by-step guide to troubleshoot and resolve these problems:
1. Update iOS:
- Go to Settings > General > Software Update and install any available updates. iOS 15.5 is not the latest version, so updating to the latest iOS version compatible with your device might resolve some issues.
2. Check Date and Time Settings:
- Go to Settings > General > Date & Time and ensure Set Automatically is turned on. Incorrect date and time settings can cause certificate issues.
3. Update Apps:
- Go to the App Store, tap on your profile picture, and update all apps, including WhatsApp and Twitter.
4. Reset Network Settings:
- Go to Settings > General > Reset > Reset Network Settings. This will reset Wi-Fi, cellular, and VPN settings, which may resolve connectivity issues.
5. Reconfigure Email Accounts:
- Go to Settings > Mail > Accounts, delete your email account, and then re-add it. Make sure to enter the correct IMAP settings provided by your email service provider.
6. Clear Safari History and Data:
- Go to Settings > Safari > Clear History and Website Data.
7. Check Storage:
- Ensure you have enough storage on your device. Go to Settings > General > iPhone Storage and free up space if necessary.
8. Reinstall WhatsApp:
- Backup your WhatsApp chats first: **WhatsApp > Settings > Chats > Chat Backup > Back Up Now**.
- Delete and reinstall WhatsApp from the App Store.
9. Reset All Settings:
- If issues persist, go to Settings > General > Reset > Reset All Settings. This will reset all settings to default without deleting your data.
If the problems continue after these steps, consider performing a full backup and factory reset:
1. Backup Your iPhone:
- Use iCloud or iTunes to back up your data.
2. Factory Reset:
- Go to Settings > General > Reset > Erase All Content and Settings.
3. Restore Backup:
- After resetting, restore your iPhone from the backup.
If these steps don't resolve the issues, it might be time to consider upgrading to a newer device, as software and hardware limitations on older models like the iPhone 6s can cause persistent issues.
