My incoming calls are going straight to voicemail

When your iPhone is locked (the screen is off), Do Not Disturb silences all incoming calls, text message notifications, and alerts on your iPhone. Unlike silent mode, Do Not Disturb sends incoming calls straight to voicemail.
https://www.payetteforward.com/why-does-my-iphone-go-straight-to-voicemail-heres-the-fix/

If you find that you have no other ways to block this number you can add the number to your contacts list then in the contact page you can set the number to go straight to voicemail in this way you will never get a phone call from that number because it will only go to your voicemail

go to contacts in the phone, go to your entry, press sub menu button, uncheck incoming calls (send calls directly to voicemail)

Denise,if the phone is a nokia, go to tools in main menu then"settings" and open. scroll to "call divert" and open. you will be in "call divert settings", open "voice calls" and "cancel All Diverts" . then reopen "voice calls" and scroll to "if out of reach" push "options" and "activate".. your diverts will then only come through when the phone is out of area or turned off . you will then get a message when your phone is on again or back in area. other phones are similar and you will need to find similar settings, regards Terry

You need to contact your service provider and have your Voicemail reset. The carrier can reset everything. This includes fixing your incoming text problem.

check your incoming calls settings and see that you did not choose it to divert to voice mail number

Please check if any call divert or incoming call barring (found at settings menu) are actives .

Sorry to hear you are having issues with incoming calls. You do wanna try a few tests. Check to make sre there's signal on your phone. There are no coverage issues. Do a powercycle, by powering the device down for about 10-30 seconds. If you have another phone with the same carrier, put your simcard in that phone. Do a test call. If it goes thru, it's software issue. If it fails, and goes straight to voicemail, then it's a network issue. Contact your carrier ASAP to get it resolved. If it's happens to be the phone. View the manual how to set the call forwarding. If that is set to be ringing and not straight to voicemail. Try a soft ware reset aka Master Reset. Your manual of this particular phone will be in there. You won't lose our number, pictures, message, etc. You'll see the phone will have the original ringtone and wall paper as if you just got it out of the box.

Cheers!

i would got into your voicemail settings and check to see if you have it set to ring once then straight to vmail.. i'm not sure how your phone is set up completely but i would assume you can adjust the amount of rings before vmail picks up.. is this phone new to you?
hope this helps..
d