can’t open any apps on my iphone

If an app won’t respond or seems frozen, you can close it, then open it again.

See this Apple article: Close an app on your iPhone or iPod touch

Close an app on your iPhone or iPod touch - Apple Support

Or try to do a Force restart iPhone -> Force restart iPhone – Apple Support (UK)

Connett Said:

"can’t open any apps on my iphone: my iphone 11 suddenly froze in the mail app. i cannot open any apps. i can’t re-start. what should i do?"

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Troubleshooting a Frozen iPhone:

Try the Tips at these Apple Support Links:

• If your iPhone is Stuck On the Apple Logo - Apple Support

• If the Screen isn’t Working On your iPhone or iPad - Apple Support

• If your iPhone Won't Turn On or is Frozen - Apple Support

• If you Need More Help - iPhone - Apple Support