If your iMessage has stopped working after installing your eSIM, there are a few things you can try to troubleshoot the issue.
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eSIM Activation - Make sure your eSIM is activated and working properly.
- Primary SIM Settings - Ensure that you still have your Primary SIM set to be used as the Default Voice Line and that the eSIM is set to be used for Mobile Data.
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Check your iMessage settings - Make sure that iMessage is enabled and that your phone number and email address are listed correctly. Go to Settings > Messages and check the settings under Send & Receive.
- Restart your device - Sometimes a simple restart can fix issues with iMessage. Turn your device off, wait a few seconds and then turn it back on again.
- Reset your network settings - Go to Settings > General > Reset > Reset Network Settings. This will reset your Wi-Fi networks and passwords, cellular settings, and VPN and APN settings.
- Update your device - Make sure that your device is running the latest version of iOS or iPadOS. Go to Settings > General > Software Update to check for updates.
If none of these steps resolve the issue contact Apple Support for further assistance.