Telephone carriers such as US Cellular, AT&T or T-Mobile may block your phone number if they have identified it as spam, fraud, or a telemarketer.  This can often occur in a call center setting in which the same phone number is used repeatedly to make outgoing calls. 

If you believe that your phone number has been blocked, you can fill out a form at this link: to request that your number is unblocked.

The following website provides strategies to follow avoid having your number labeled as Spam and blocked.  Some of these strategies include:

  • Register your number with the major caller ID reputation websites (links above)
  • Ensure people can reach you if they call back
  • Rotate Caller ID so you don’t always call out on the same number

Please contact us at its-uc@uiowa.edu if assistance is required.

Article number: 
124501
Last updated: 
April 7, 2022