want to tap and read or delete messages or phne calls with my Iphone lying flat
My IPhone X won’t let me use keys with phone lying flat
iPhone X
If the problem persists, visit an Apple Store or an Apple Authorized Reseller in your region for assistance to diagnose the problem.
And they could offer a possible solution.
You will first have to make an appointment due to the pandemic.
See: Contact Apple for support and service
Contact Apple for support and service - Apple Support