iMessage and phone number not updating

Recently joined Lebara from 02.
Ported my old number to the new sim. This worked I can make calls and texts using my original number.
but in the settings this hasn’t changed, my iMessage is stuck with email and people have confirmed this through message and in mobile service the temporary Lebara number is still there and won’t update.

any ideas? Feel like I’ve tried everything to fix this now

I’m in the same boat ported 2 numbers across one went smoothly the other didn’t show the number in mobile settings so iPhone thinks my number isn’t linked to sim it seems. iMessage if you enter the number just says an error occurred. Customer support just say wait till 25th ported on 21st…not a great start

I have resolved this. I called up Lebara customer services and they said this is an IPhone issue.
They instructed me to take the sim out the phone, then reset network settings then insert the sim.
This has resolved the issue for me anyway, hope it helps.

I actually did all that this afternoon removed the sim, turned off the phone put sim back in on data not WiFi still nothing, then did a network reset as instructed that didn’t help either.
yet my second sim no problem at all number was visible in Lebara settings immediately.