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How to Turn On Caller ID and Fix Unknown Number Issues
Question details
The user needs to enable their Caller ID so their phone number is visible to recipients instead of appearing as 'Unknown'.
- Product
- Mobile Devices and Microsoft Teams
- Device & OS
- not provided
- Scenario
- Making outgoing calls via a mobile carrier network or Microsoft Teams application.
- Observed behavior
- The outgoing phone number appears as 'Unknown' to call recipients instead of displaying the actual number.
Ensure your mobile device software or Microsoft Teams application is up to date, and have your account details ready in case you need to contact your mobile carrier.
Adjust Device Settings and Contact Your Mobile Carrier
Modify your smartphone's built-in caller ID settings and verify with your carrier if network restrictions apply.
Open your phone's Settings app and navigate to the Call Settings or Phone section.
Look for 'Show My Caller ID' or 'Additional Services' and ensure the toggle is turned on.
If the option is greyed out or resetting it does not work, contact your mobile carrier (such as Telstra) to remove any network-level caller ID block on your account.
Modify Caller ID Settings in Microsoft Teams
If you are using Microsoft Teams for calling, check the application settings or consult your IT administrator.
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Frequently Asked Questions
Why is the Caller ID option greyed out on my smartphone?
This usually means your mobile carrier controls the caller ID settings at the network level. You will need to contact your provider directly to enable or disable caller ID visibility on your account.
Can I hide my caller ID for a specific call only?
Yes, in many regions you can dial a specific prefix code (such as *67 in North America or #31# in Europe and Australia) before dialing the phone number to hide your caller ID for that single call.
Why does Microsoft Teams show my number as unknown to external contacts?
Your organization's IT administrator may have configured a Caller ID policy in the Teams Admin Center that masks outgoing numbers or replaces them with a generic company switchboard number.
