Welcome to the Community Forums! Thank you for your post.
I'm sorry to hear you've been unable to receive and send text messages suddenly, that is quite strange. Can you think of anything at all that's changed with your handset or SIM which could have caused this?
Can you please confirm the following so we can advise further:
The make and model of your handset
If you're able to receive/make calls
If you're able to use mobile data
What happens when you try to send a text/when someone tries to text you
Right I see, thanks for letting us know. It could either be an issue with the SIM, or how the handset is behaving with the SIM. As nothing seems to have triggered this change it is a strange one.
Have you noticed if this issue only occurs in a specific location or in all areas? Can you also please try manually selecting your network from your settings? It's best to try this after popping in and out of aeroplane mode
We want to best help regarding this. Just to confirm, can you please go to the phone settings and ensure that your mobile number is showing there in the correct format? You may also find the following link useful https://support.apple.com/en-gb/HT207006.