To block numbers on US Cellular, you block them directly on your iPhone or Android device, since UScellular does not offer a carrier-account tool for manually blocking a specific phone number. The primary method for blocking calls and numbers is using your phone’s built-in settings, with UScellular’s Call Guardian app available for spam protection.
How to block numbers on US Cellular: what works
UScellular’s official materials focus on spam and fraud protection rather than a detailed workflow for blocking one specific number through your account. The carrier’s documented carrier-level blocking solution is Call Guardian, a device app for iOS and Android. For blocking an individual telephone number, you must use the controls built into your phone by Apple, Google, or Samsung. Some UScellular Android devices also include a built-in carrier 'Call & Message Blocking Feature' accessible directly in the Phone or Messaging app Settings: open the Phone app, tap More > Settings > Call & Message Blocking, or open the Messaging app, tap Menu > Settings > Call & Message Blocking, then add a number to block calls and texts at the network level.
Block a number on iPhone
Apple documents several ways to block a number directly on your iPhone. These steps work on any UScellular iPhone with no carrier-specific limitation.
- Open the Phone app and tap Recents.
- Tap the phone number or contact you want to block.
- Scroll down and tap Block Caller.
You can also block from FaceTime, Messages, or Mail: open the item, tap the contact at the top, and choose Block Caller or Block this Contact. For a manual list path, go to Settings > Privacy & Security > Blocked Contacts > Add Blocked Contact > Block Contact.
Block a number on Android
Google’s Phone app provides the standard blocking method for most Android devices. Samsung Galaxy phones follow the same core path.
Google Phone app
- Open the Phone app and tap More > Call history.
- Tap the call from the number you want to block.
- Tap Block / report spam.
Alternatively, go to More > Settings > Blocked numbers. From there you can add a number manually or turn on Unknown to block unknown callers. To block texts only, open the Messages app, tap the conversation from the number, tap More > Block contact, or go to the Messages or Texts tab, tap Menu > Blocked contacts and add the number.
Samsung Galaxy
To block spam calls on Galaxy S21 or any Samsung Galaxy phone, open the Phone app, tap More options (three dots), tap Settings, then Block numbers. You can add a number and tap Add, or block a number from Recents and confirm with Block.
UScellular’s Call Guardian for spam calls
UScellular’s documented spam-blocking service is Call Guardian, a free device app for iOS and Android. The FCC notes that U.S. Cellular offers call blocking through this application. A Premium option is also available. If you want to opt out of the call-blocking service, call 1-888-944-9400 or visit a local store. For third-party alternatives, apps like Truecaller, Hiya, and Mr. Number also provide spam identification and call blocking.
When to contact UScellular
Contact UScellular at 1-888-944-9400 or visit a store only for changes to your Call Guardian service, such as opting out or upgrading. Do not call to block an individual number, that is handled entirely on your device using the steps above. You can also contact US Cellular Customer Support for general troubleshooting help if the built-in blocking steps on your device are not working as expected.
Frequently Asked Questions
Will a blocked number know they have been blocked?
No. The blocked caller receives no notification. They may infer they are blocked if calls go straight to voicemail or texts are not delivered.
Can I block a number from sending texts only?
Yes. On iPhone, block the number from the Messages app by tapping the conversation, tapping the info icon, and selecting Block this Caller. On Android, blocking a number in the Phone app also blocks texts from that number.
Is there a limit to how many numbers I can block?
Blocking very large numbers of contacts may affect device performance.
Can I unblock a number after blocking it?
Yes. On iPhone, go to Settings > Phone > Blocked Contacts and swipe to unblock. On Android, go to the Phone app’s Blocked numbers settings and remove the number.
Does Call Guardian block specific numbers I choose?
Call Guardian is designed for spam and fraud protection, not for manually blocking a specific number. To block an individual number, use your phone’s built-in blocking controls.
How do I block numbers on US Cellular?
Block numbers directly on your device. On iPhone, use the Phone or Messages app to block the contact. On Android, use the Phone app’s Block feature, or on supported UScellular devices, go to Phone app Settings > Call & Message Blocking to block at the carrier level. You can also use the Call Guardian app for spam protection.
