i cannot open my text messages app. why?

What happens when you try?

Try a forced restart.

• Press and quickly release the volume up button

• Press and quickly release the volume down button

• Press and hold the side button.

• When the Apple logo appears, release the button.

https://support.apple.com/en-in/guide/iphone/iph8903c3ee6/ios

Try switching off WiFi and see if it works on cellular.

Muself and several family members have Been experiencing this since mid day yesterday (6/15). We’ve tried rebooting but no success.