How do I block an incoming phone number from calling me?

There are a couple of ways to block an incoming phone number from calling you:  

Option 1:

• Tap the Menu icon in the top left corner
• Tap Settings
• Tap Calls
• Tap Block List
• Tap Block Caller
• Select the contact you want to add to the Block List 
  - to remove that contact from the Block List, tap Edit > tap the red icon > tap Unblock

 Option 2

• From the Call Log under your Sudo profile 
• Tap the 'person' icon to the left of the contact/phone number
• Tap the arrow to the right of the phone number under the Participants section
• Tap Block this Contact

You can also reset (change) your number if the annoyance you are receiving warrants it.