Calendar has no + sign

Check Settings > Calendar > Accounts.

Are the appropriate accounts listed there, with calendar access enabled?

If the above does not resolve this, force restart, and try again.

Force restart iPhone - Apple Support

Also check for updates, if not already running iOS 16.4.1.

If you have an add-on VPN app or similar add-on security apps, remove it all, and try again.

Foxysr123 Said:

"Calendar has no + sign : Calendar has been hacked no longer has a + sign"

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Set this Up Anew:

If something has gone missing somehow, then the map may have become corrupt. So, reset your iPhone, as if you were to sell it. Perform as interacted here, including the iCloud Logout and backup creation: What to do Before you Sell, Give Away, or Trade in your iPhone, iPad, or iPod touch - Apple Support. All would be seen anew once you reset it. The phone number will not be removed --so no worries there.

Look in the upper right corner.

What is there?

Foxysr123 wrote:

ear I removed all vpn. How do I do a forced shutdown

I linked to it. Here it is again: Force restart iPhone - Apple Support