Ideas Signals Validator

93 Signals+1

User-Controlled Android Call Screening

A transparent caller identification and blocking app that shows what it detected, what it blocked, and why.

Added Aug 20, 2026

call screening

consumer security

telecommunications

Opportunity score

Medium opportunity (74%)

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The Problem

People pay for caller-screening tools but still receive scam calls, lose caller identification, or cannot inspect phone numbers and call times after updates. Existing products also give users little evidence that blocking is active or control over which calls should be blocked.

Potential Solution

Build an Android call-screening product centered on verifiable operation and manual control. It would retain a clear call history, identify calls when reliable data exists, let users approve blocking rules, and display an on-device status check explaining whether required permissions and phone settings are working.

Why Now?

The signals show failures across several established products rather than one isolated complaint. Frequent product changes and inconsistent device-level behavior create room for a narrowly designed alternative built around reliability, transparency, and user control.

Market validation

Search demand

Trend snapshot pending

Competition (0)

No matched competitors yet

Showing 1-20 of 93 signals

Google PlaySep 13, 2026

Calls Blacklist - Call Blocker

Junk app, does NOT block any calls. Spam calls still rang through. Does not work. Will not be paying for the paid version. ..

Google PlaySep 12, 2026

CallApp: Caller ID & Block

Great app lets me know who calls before I pick up the phone. Big database of known spammers and caller id the best out there. The only downside is it doesn't block spam texts from politicians and others I don't want to donate to. I suggest keyword filters like Mezo SMS premium has. I canceled their service because it blocked texts from my contacts list without the spam toggle being on and technical support took weeks to respond to my email.

Apple App StoreJul 27, 2026

Verizon Call Filter

Not the best Where to begin? First, this app blocks calls from numbers that are in my contacts. Why on earth would I want to block a number from a caller I have added to my contacts?! My power company, Xcel Energy, was calling about power outages. I have their number in my phone contacts, but this app blocked them. It’s inconceivable how anyone thought that feature would be helpful. Second, the app doesn’t work half the time. Either it allows spam calls, yet still

Apple App StoreSep 8, 2026

Robokiller: Spam Call Blocker

Excellent app but! I need to block area codes that I’m getting spam calls from, there are area codes that I just don’t know anyone from them, and if I were expecting a phone call from that area code I can temporarily unblock it until I’m finished with it, please allow for area codes to be blocked instead putting the individual numbers in, spam callers simply use a different number but same area code

Apple App StoreAug 11, 2026

Robokiller: Spam Call Blocker

It does what it’s supposed to do but… I love the features that it offers and everything it does block the calls, but I end up having so many voicemails like one time 13 voicemails but the text I still get which I’m still working on the Settings one thing I would love for Robokiller to have the option to get paid for every spam call in text that you receive that will be highly highly recommended other than that, it's a great app. Update: everything is goo

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