Hi
Can you not recieve any sms and imessage.
Plz try ure Sim in another phone as a process of elimination 2 rule out the phone or sim that may be at fault.
A reset of the iPhone may help.
On the iPhone hold down the Sleep/Wake Button and Home button together until the Apple Logo shows. Then On seeing this Apple Logo release both buttons ,and the iPhone will reset , which has been known to clear most glitches.
Settings -> General -> Reset -> Reset Network Settings.
Current Phone >
Samsung Galaxy s²⁵ Ultra 512gb.