T-Mobile
What if a call is misidentified and is either not a scammer or they are a scammer?
  1. We don’t expect this to happen, but if a customer suspects that a legitimate number is being blocked, or if they think a number should be identified as a scammer, they can submit a request for an update 
  2. Scam Block may, in rare circumstances, inadvertently block desired calls. Please note that you are free to turn off Scam Blocking at any time by using USSD code #OFB# (#632#).
Verizon 
We get many complaints about unwanted computerized calls, and we get it - no one likes robocalls. To help you identify them, we've added a new Spam Alerts feature to your home phone's Caller ID. Your Caller ID will show "SPAM?" before the caller's name that has been identified* as a possible unsolicited call.
*A complex and always-improving algorithm is used to determine which calls match the SPAM criteria. While we're focused on identifying and alerting you to these types of calls as much as possible, you may still receive unsolicited calls from spammers/scammers as these calls will not be blocked automatically. You still choose which calls you to want to answer and which ones you don't. Coming Soon: To report numbers that you believe should be listed as spam or incorrectly labeled as such, please visit verizon.com/SpamAlerts.
If your business's phone number is being improperly flagged as a robo/spam on Verizon customer's phones, you can fill out a form here to request it be corrected.
 
AT&T
A request can be submitted to Hiya to lower the SPAM rating; Hiya works with multiple carriers to lower SPAM ratings, amongst other things; request usually takes a week.
Report a mistake in spam protection
    1. Open the page and select the issue as "Change or Remove the caller ID information or Spam Rating of a number."
    2. Add your email address.
    3. Provide the description.
    4. On the "Does the number belong to a business or a person?" Choose "Business"
 
Google
Google allows individual users to unblock numbers marked as spam or a scam but does not provide a mechanism for the phone number’s owner to request spam or scam removal.
Report a mistake in spam protection
  1. If a call from someone you know is marked as spam, you can report the mistake. Open your device's Phone app phone.
  2. Tap Recent calls.
  3. Tap the call mistakenly labeled spam.
  4. Tap Unblock number and then Unblock.
  5. Future calls from this number won't be marked as spam.
 
Apple
Apple does not advise of a similar form or way to report false flagging of numbers.
In addition to the scam detection features offered directly by carriers and phone manufacturers, there are numerous 3rd party apps that users can download on both iPhones and Android devices to flag and/or block potential scam calls. There is no way to “audit” or verify if a number is on one of these numerous spam lists. Suppose a legitimate number is blocked as spam or scam.

In that case, it may be advisable to deactivate that number and purchase a new number if the above options did not resolve the situation.


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Why is my number showing as SPAM?

This could be caused by the carrier used by the receiver's end that has marked the number as Spam.  The DID is probably being spoofed by spammers/scammers which causes the providers to see the DID as SPAM. Unfortunately, there is no way to identify spoofed numbers because they use the same paths and look the same as any other legitimate phone call. You can report these calls to the FCC for further investigation. Below are some helpful links on Spoofing:

https://www.fcc.gov/consumers/guides/spoofing-and-caller-id

If you are instead suspecting calls that are coming from spoofed numbers see our FAQ article - How do I handle calls from suspected spoofed DIDs?Calls Labeled as Potential SPAM or Being Blocked?Multiple companies provide analytics, each with their own tracking and radar systems. It is possible your numbers are being blocked or labeled as SPAM due to false flagging.

Let the Carriers and Database Providers Know

If you know the carrier/provider that may be falsely identifying, blocking, or labeling your number(s) in the databases that feed this information, please contact them directly using the contact information below.

AT&T:
Call: 800-337-5373
Email: [email protected] 
Contact via website: hiyahelp.zendesk.com/hc/en-us/requests/new
Calling parties can also provide feedback at Submit a request – Hiya (zendesk.com)

CenturyLink:
Email: [email protected]
Contact via website: nomorobo.com/contact and choose “Report a Number.”

First Orion:
Contact via website: calltransparency.com.

Frontier:
Email: [email protected], or contact Nomorobo.

Hiya:
Contact via website: hiyahelp.zendesk.com/hc/en-us/requests/new.
Hiya provides a service for legitimate businesses to register, through connect.hiya.com.

NoMoRobo:
Contact via website: nomorobo.com/contact and choose “Report a Number.” Nomorobo has a white list feature to which subscribers can add numbers in order to prevent erroneous blocking.
Email: [email protected]

Sprint: 
Call: 888-211-4727
Report to https://reportarobocall.com/trf/

T-Mobile:
Contact via website: https://callreporting.t-mobile.com/

Contact through First Orion at calltransparency.com
TNS:
TNS provides a portal on its website for identifying inaccuracies, through its robocall feedback website, reportarobocall.com/trf, and it allows companies to subscribe to alerts to inform them when the number is classified as a spammer, spoofer, scammer, or robocaller.

US Cellular:
Call: 888-944-9400
Contact via website: uscellular.com/support/robocall/index.html

Verizon:
Contact via website: voicespamfeedback.com/vsf/

Windstream:
Call: 800-347-1991
Contact via Website: windstream.com/Support/Phone/Troubleshooting-repair
YouMail:
Email: [email protected]
Note: When sending requests to the NoMoRobo and YouMail email addresses listed above - please include the calling number, name associated with the number, and details regarding why it is not a spam number.
Let Analytic Providers Know

Call Transparency: (First Orion) CallTransparency.com validates you are a legitimate business and verifies your calling numbers.

Free Caller Registry: (First Orion, Hiya, and TNS) This free portal helps entities reach the analytics companies that support the major wireless carriers in the US.

Note: Analytics companies will review the requests and may still flag calls depending on their analytics or research.

For Inteliquent Numbers

Inteliquent continues to work with the industry through our participation in associations and partnerships with customers to help resolve this issue while still working towards flagging and stopping illegal spoofing and robocalling.

Inteliquent is the CLEC (Competitive Local Exchange Carrier) for the numbers however because they are not the end-user, they are often limited in how they can assist due to CPNI (Customer Proprietary Network Information).

If you have attempted all options listed above and if it has been 72 hours or longer without relief, please open a ticket with SkySwitch Support including the list of phone numbers with call examples, dates/times, calling number, and the number called.

SkySwitch Support will then contact Inteliquent, where they can:

Request your number(s) to be whitelisted with Neustar.Open repair tickets with the problem carrier. Call examples will be needed to determine who may be falsely labeling your calls.