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Sometimes—it depends on what your phone means by “unknown.” Phone by Google explicitly blocks private or unidentified caller IDs when you enable Block unknown. Apple’s iPhone guidance describes silencing calls from numbers not saved in your contacts, but does not explicitly promise that it catches every hidden or private caller ID. Samsung Galaxy phones offer controls for unknown or hidden numbers, though labels and availability vary by device.
“Unknown” can mean two different things
A phone may treat “unknown” as a visible phone number that is not in your contacts, or as a caller whose number is withheld or otherwise unidentified. Those are not interchangeable: a setting that handles unsaved numbers may not necessarily block private caller IDs.
Also check what the setting does. A call can be screened, silenced and sent to voicemail, filtered, or blocked outright. The label alone does not establish which behavior you will get.
Quick Recap
Bestseller No. 5
Best Value
Anker USB C Hub, 5-in-1 USBC to HDMI Splitter with 4K Display
- 5-in-1 Connectivity: Equipped with a 4K HDMI port, a 5 Gbps USB-C data port, two 5 Gbps USB-A ports, and a USB C 100W PD-IN port. Note: The USB C 100W PD-IN port supports only charging and does not support data transfer devices such as headphones or speakers.
- Powerful Pass-Through Charging: Supports up to 85W pass-through charging so you can power up your laptop while you use the hub. Note: Pass-through charging requires a charger (not included). Note: To achieve full power for iPad, we recommend using a 45W wall charger.
- Transfer Files in Seconds: Move files to and from your laptop at speeds of up to 5 Gbps via the USB-C and USB-A data ports. Note: The USB C 5Gbps Data port does not support video output.
- HD Display: Connect to the HDMI port to stream or mirror content to an external monitor in resolutions of up to 4K@30Hz. Note: The USB-C ports do not support video output.
- What You Get: Anker 332 USB-C Hub (5-in-1), welcome guide, our worry-free 18-month warranty, and friendly customer service.
Rank #4
Sale
UGREEN USB to USB C Adapter Combo 4-Pack, 10Gbps USB C Converter Space Gray
- Dual Converters, Infinite Potential：Includes 2× USB C male to USB A female adapters and 2× USB A male to USB C female adapters. Perfect for a wide range of uses—tablets with Bluetooth keyboards, expand USB ports on macbook, and more. Two different converters for all your daily needs
- Next-Level 10Gbps & 3A Charging: No more slow 480Mbps, this usb to usb c adapter has a transfer speed of up to 10Gbps, allowing you to do more transferring in less time. This usb adapter fits both USB A and USB C charger, supporting up to 3A fast charging
- Upgraded Exquisite Craftsmanship: With an aluminum alloy housing and metal connector, the usbc to usb adapter is extremely durable and sturdy. Rigorously tested to withstand more than 10,000 times of plugging and unplugging, ensuring long-lasting performance
- Broad Compatible: The usb c to usb adapter widely supports all USB C/ USB A devices like laptops, tablets, cellphones, car chargers, and phone chargers. Such as compatible with MacBook Pro/Air 2023/2022, Thunderbolt 4/3 Devices,Apple MagSafe Watch 9/8/7/SE/Ultra, iPad Pro 2022/2021, Samsung Galaxy S23/S20/S10, and iPhone 17/16/15 Pro. Plug and play
- Please Note: To reach 10Gbps speed, keep the cable under 3.3 ft. For USB A Male to USB C adapters, try flipping the USB C connector. USB C Male to USB A adapters support bidirectional 10Gbps transfer within 3.3 ft
Rank #3
Sale
Anker USB C Hub, 7in1 Multi-Port USB Adapter, 4K@60Hz USBC to HDMI Splitter
- Sleek 7-in-1 USB-C Hub: Features an HDMI port, two USB-A 3.0 ports, and a USB-C data port, each providing 5Gbps transfer speeds. It also includes a USB-C PD input port for charging up to 100W and dual SD and TF card slots, all in a compact design.
- Flawless 4K@60Hz Video with HDMI: Delivers exceptional clarity and smoothness with its 4K@60Hz HDMI port, making it ideal for high-definition presentations and entertainment. (Note: Only the HDMI port supports video projection; the USB-C port is for data transfer only.)
- Double Up on Efficiency: The two USB-A 3.0 ports and a USB-C port support a fast 5Gbps data rate, significantly boosting your transfer speeds and improving productivity.
- Fast and Reliable 85W Charging: Offers high-capacity, speedy charging for laptops up to 85W, so you spend less time tethered to an outlet and more time being productive.
- What You Get: Anker USB-C Hub (7-in-1), welcome guide, 18-month warranty, and our friendly customer service.
Rank #2
Anker USB-C Hub, 5-in-1 USB Hub for Laptops, 4K HDMI Multiport Adapter
- 5-in-1 USB-C Hub: Experience comprehensive connectivity featuring a Power Delivery input, two USB-A 2.0 ports, a USB-A 3.0 port, and an HDMI port. (Note: The USB-C power delivery input port is only for connecting an external wall charger to power your laptop and cannot power peripheral devices.)
- 90W Pass-Through Charging: Achieve optimal charging with 90W pass-through power to your laptop, supported by a total input of 100W, with the hub reserving 10W for operational efficiency. (Note: Wall charger not included.)
- Quick Data Transfers: Accelerate your productivity with rapid data transfers using a high-speed 5Gbps USB 3.0 port and two 480Mbps USB 2.0 ports.
- 4K HDMI Display: Enhance your visual experience with a hub capable of delivering 4K resolution at 30Hz in both mirror and extend modes. Please note that this hub is compatible with MacBook (macOS 12 and newer), Windows 10 and 11, ChromeOS, and laptops equipped with DP Alt Mode and Power Delivery. Note: This device is not compatible with Linux.
- What You Get: Anker USB-C Hub (5-in-1, 4K HDMI), welcome guide, 18-month warranty, and our friendly customer service.
#1 Best Overall
Elebase USB to USB C Adapter for iPhone 18 Pro Max,USBC Car Charger Adapter
- Read Before You Buy — No Video Output: These adapters support charging and USB 2.0 data transfer, but cannot transmit video signals. Except for standard USB webcams (which use USB data only), they are not compatible with HDMI/DisplayPort cables, video-capable USB-C hubs, or docking stations with video output.
- Convert USB-A Ports to USB-C: Designed to connect USB-C earphones, cables, flash drives, card readers, and other USB-C accessories to standard USB-A ports. Plug-and-play with no drivers or software required.
- Aluminum Alloy Housing: Built with a sturdy aluminum alloy shell that aids in heat dissipation and protects against daily wear and scratches. Designed to maintain a stable and secure connection.
- Compact & Travel-Friendly: The ultra-compact design allows the adapter to stay plugged into your device without blocking adjacent ports or adding bulk, reducing wear and tear on your original USB ports.
- 12-Month Warranty: Backed by a 12-month manufacturer warranty for peace of mind. Designed to meet strict quality control standards for reliable everyday performance.
What each phone’s setting does
| Phone or app | What “unknown” covers | What happens to the call |
|---|---|---|
| Phone by Google | Private or unidentified caller IDs. Visible numbers not saved in contacts are not blocked by this control. | Calls from private or unidentified numbers are blocked. Google says blocked calls do not appear in call history. |
| iPhone | Apple describes unknown callers in its guidance as numbers not saved in contacts; its cited guidance does not explicitly state that every hidden caller ID is covered. | With the Silence option, calls from unsaved numbers are silenced, sent to voicemail, and shown in Recents. |
| Samsung Galaxy | Samsung documents controls for unknown, private, or hidden numbers. | Blocking options are available in the Phone app’s call settings; exact labels and availability vary by model, software version, and carrier. |
How to check or block hidden callers
- Identify your calling app and phone. Check whether you use Phone by Google, Samsung Phone, or Apple’s Phone app, and note your phone model.
- Look for a setting that names hidden caller IDs. In Phone by Google, open Phone > More > Settings > Blocked numbers, then turn on Unknown. Google says this blocks private or unidentified numbers while allowing visible numbers that are not in contacts. On Galaxy phones, look in the Phone app’s call settings for wording such as Block unknown/hidden numbers or Block calls from unknown numbers. For iPhone, Apple’s documented Silence option handles unsaved numbers; do not assume from that label alone that all withheld caller IDs are covered.
- Verify the setting on your own device. Check the blocked-call list and, if appropriate, confirm how the phone handles a hidden call. The support pages describe intended settings behavior, not test results for every device or carrier.
If hidden calls still get through
- Check that you enabled a control specifically for private, hidden, or unidentified callers rather than one that only silences numbers missing from contacts.
- On Samsung Galaxy, menu names and options can differ by model, software version, and carrier. Samsung’s [call-settings guidance](https://www.samsung.com/ca/support/mobile-devices/manage-call-settings-on-your-galaxy-phone/) describes that variation.
- If the option is missing or does not behave as expected, ask your phone manufacturer or carrier about your exact model, region, software, and service configuration. The cited guidance does not establish a universal carrier-level rule.
Official guidance
- Google Phone app: Block or unblock a phone number explains the Unknown control and its distinction between private or unidentified calls and visible numbers not saved in contacts.
- Apple: Screen and block calls on iPhone describes screening, filtering, and silencing calls from unsaved numbers.
- Samsung: How to Block Numbers on a Galaxy Phone covers blocking unknown or hidden callers on Galaxy phones.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
Special offer. See more information about Outbyte and uninstall instructions. Please review EULA and Privacy policy.
