You can reduce unwanted interruptions by screening unknown callers, sending unsaved numbers straight to voicemail, or silencing calls your carrier identifies as spam. These are separate iPhone controls, and none guarantees that every unwanted call will be caught.
Choose how your iPhone handles unknown callers
Apple’s unknown-caller controls apply to numbers that aren’t saved in your Contacts. On current iOS versions, open Settings > Apps > Phone and look for Screen Unknown Callers. If that option is available, choose the setting that suits the calls you expect.
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Ask Reason for Calling
With Ask Reason for Calling, the iPhone asks an unsaved caller for more information before ringing. Apple says that after the caller shares their name and reason, the phone rings and presents the response so you can decide whether to answer. This can help when you may need calls from schools, clinics, delivery drivers, or new clients but want context before picking up. Apple Support explains call screening.
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Silence
Silence sends calls from unsaved numbers to voicemail without ringing. Choose it if avoiding interruptions matters more than answering a legitimate first-time caller immediately. Save important numbers in Contacts to reduce the chance that their calls are treated as unknown. Apple’s unknown-caller guide also explains how missed calls and voicemails can be kept in an Unknown Callers list.
#1 Best Overall
- Wide Compatibility: The ALAFLY phone access blocker works with both iOS and Android devices. Compatible with iPhone 18/17/16/15/14/13/12 series, Samsung Galaxy S26/S25/S24/S23/S22/S21 series and other Android phones. Whether it’s your phone, your partner’s phone, or your child’s device — can support multiple users without platform limitations or extra purchases (Note: Not compatible with the Google Pixel series)
- Simple & Reliable Control: Open the companion app, select your blocked apps and websites once, and tap to start a focus session. Need to end early? Tap again. Emergency access is always available when needed. The module remembers your settings so sessions can start quickly and consistently. As simple and reliable as a light switch
- Smart App Control for Focus & Productivity: No subscription required—includes lifetime access to the ALAFLY Tap app with easy setup so you can focus on what matters most.Create custom modes for work, study, and family time to match different parts of your day.Track your focus time with built-in insights, including total usage and daily averages, helping you build better digital habits
- Regain Control of Your Screen Time:This ALAFLY phone physical access blocker adds real-world friction that supports more consistent focus habits over time. The simple act of tapping becomes a focus ritual that helps signal your brain it’s time to concentrate. When your phone is locked, it stays locked through your focus session
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Never
Never lets unknown callers ring normally. Use this if you want calls from numbers not in Contacts to come through without screening or silencing.
Turn on the carrier’s Spam filter separately
The Spam filter is different from unknown-caller screening. It relies on your carrier identifying a call as potential spam or fraud; when available and enabled, those calls are silenced and sent to voicemail. It does not catch every unwanted call, and whether the filter appears depends on your carrier. In Settings > Apps > Phone, check the call-filtering options and turn on Spam if it is offered. Apple describes this carrier-based feature in its call-screening and blocking instructions.
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- This is the latest version Telephone Call Blocker with hidden or unavailable call numbers can be blocked. And there is no fees to use it; Please keep the manual for future use.
- Block up to 4000 individual phone numbers, including incoming and outgoing calls , prefixes and up to 10 digit area codes.
- One-touch to Block: Locate a number and then press Block to add it to the blacklist.Better set the call blocker in series ( one end of it connected to your phone and another end to the PSTN telephone line); Though it can also be set up parallel, but not compatible with some phone systems.
- Permanent storage of the numbers in the blacklist even power is off or telephone line is plugged out.
- Battery free: It is line powered, no need battery. And it works with almost all single line telephones. If you find some numbers are blocked but you never mean to, then press Block and check your blacklist, then delete those numbers which like area codes or prefix numbers.
Review calls that were filtered
Filtered calls are not necessarily erased. Open the Phone app and use its Filter button to check Unknown Callers or Spam, if those filters are available. In iOS 26 or later, the Phone app’s Unified layout provides filters from the Calls tab; with the Classic layout, call history is under Recents. Additional filters, including Spam, depend on the carrier. See Apple’s guide to the Unified layout in Phone.
Quick Recap
Best Value
Rank #4
- [ IMPORTANT NOTE 1 ] This product is a call blocker only and does not have a telephone or answering machine function. No phone or answering machine is included in the package. Before purchasing, please make sure that your telephone line has Caller ID service and that it is an ANALOG line. the ENF860 requires Caller ID service from your telephone line provider to work and is for analog lines only ! No mains power required, just plug in the phone line to use
- [ IMPORTANT NOTE 2 ] In BLOCK mode, there will STILL BE some new variant numbers bypassing the database making the phone ring, you NEED to manually set up to block them OR switch to FAMILY mode to let only the numbers in FAMILY LIST through. Please refer to the manual for the CORRECT SETTINGS.
- Dual mode;In BLOCK mode you can block callers by Numbers and Names; In FAMILY mode all callers outside the FAMILY LIST are blocked;The two modes can be switched at any time as needed and NO data will be lost after switching modes.
- Preloaded with a large number of spam numbers that have been the subject of repeated complaints ; Users can also manually add 4000+ numbers to the NUMBER LIST to build their own database ; Add 256 NAMES to block calls by name.
- Blocks INTERNATIONAL, PRIVATE/WITHHELD, and Out of Area numbers by default; users can SET to block the entire area code or changing numbers starting with a fixed number, such as 00, 800, 855, 999, 7324, 33626, 134567, etc.
Rank #3
- How it Works: SPAM identified calls are instantly blocked automatically. Preferred Calls Ring through like normal with Caller ID displayed. Your phones connected to the TEL port Won't Ring on Blocked Calls. Create your own Invited or Allowed Family (White List) and block All other callers. Use the Dual Block Buttons to Block a NAME or NUMBER Displayed. Remote Block a Call when Dialing * 2 # through your telephone handset.
- The Patented ProSeries 3 Call Blocker from Digitone is an Easy Installation and is Simple to Use. No need to rush over and tap a red button when the ProSeries has already blocked a known unwanted SPAM, Out of Area, Private, Anonymous, 800 Service, ROBO?, Dashes, "Quotes" or V123+ call. Use Call History to select Any Caller to Block by (Double Tap) Name or Number. Block any NAME like: Unavailable, Unknown, SCAM RISK, City + State, Potential Scam, Wireless Caller. Block ANY call without answering, as they call in with either RED button.
- Feel confident that the ProSeries already Blocks Millions of Known Unwanted Numbers and Fake Names. No need to change your existing phones or service. Works with Any Analog Corded, Cordless Phone or Fax System on any telephone service. Large Back-Lighted Display. Got questions? Call the number on the front screen of the ProSeries 3.
- Works with all USA phone companies: AT&T, Cox, Spectrum, CenturyLink, Cable Modems, DSL, FIOS, or Digital Services from VoIP Telcos like [V] from Verizon, Ooma Telo, Ooma Basic, Vonage, Magic Jack etc. Also, works in Mexico, Canada, Brazil, European Union (ETSI), Australia, Singapore and others with North American standardized phone lines.
- Allow any blocked caller to ring through like normal with the Green Invite Button. Double Tap the Green Button to add VIP callers shown in Call History. Note: Caller ID Name and Number Service from your phone company is required for this model to work automatically.
Know when screening may not work
- Apple says screening does not operate while the iPhone is roaming.
- Screening is turned off for 24 hours after a call to emergency services.
- Live Voicemail may provide a real-time transcription, but its availability varies by carrier, country, region, or language. Apple’s voicemail setup guide covers availability.
- Labels and options can vary with iOS version and carrier. If you do not see one of these controls, check your Phone settings and carrier support.
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