Calls on my iPhone 13 mini are going straight to voicemail
Incoming calls go straight to voicemail. I've checked settings (Sounds and Haptics) and checked the volume buttons on the left side, and when I press on the upper button a red bell with a strike through it shows up whether the volume high or low. Also, under Sounds and Haptics section "Keyboard Feedback", it reads "none" and the"Lock Sound" and "System Haptics" are both green. I've missed several important calls recently. Help, and thanks!
[Re-Titled by Moderator]
iPhone 13 mini, iOS 18