iMessage

I have just joined Lebara and carried over my mobile number. Unfortunately I can’t receive or send iMessages despite the correct setting on my iPhone.
I initially had a Lebara number and a few days later I changed back to my original mobile number. Any suggestions?

Taken from google.

iMessage not working on Lebara often means your phone number isn't registered or activated; try toggling iMessage/FaceTime off and on in Settings, restarting your phone, ensuring your number is correct under Settings > Phone > My Number,

Confirming you have strong Wi-Fi or mobile data. If issues persist after switching to Lebara, reset network settings or check your Apple ID settings to ensure your number is verified.

Restart Phone & Toggle: Turn off iMessage & FaceTime in Settings, restart your iPhone, then turn iMessage & FaceTime back on and wait for activation.

Check Network: Ensure you have a strong Wi-Fi or mobile data connection.

Verify Number in Settings: Go to Settings > Phone > My Number and make sure your correct Lebara number is entered.
Reset Network Settings: Try resetting network settings (Settings > General > Transfer or Reset iPhone > Reset > Reset Network Settings).

If You Just Switched to Lebara
Apple ID Verification: Go to Settings > Messages > Send & Receive, ensure your number is selected. Also check Settings > FaceTime and your Apple ID details for your number.

APN Settings: Sometimes carrier settings need updating; search online for "Lebara APN settings UK" and manually enter them if needed (Settings > Mobile Data > Mobile Data Network).