What it does
- Screens calls. A listed number arrives with a label on the lock screen, so you decide whether to answer. Switch on blocking for the highest-risk tier and those calls stop ringing.
- Files scam texts. A text from a listed sender goes to the Spam folder in Messages instead of your inbox. You can also block a name — any text using it is filed, whatever number it comes from.
- Works on the device. The list is downloaded to your phone and the matching happens there. Your calls and messages are not sent anywhere.
Why blocking is off by default
The listings come from consumer complaints. Nobody checks them with the number's owner, so a legitimate business can appear on the list — a clinic's callback line, a bank's fraud desk.
iPhone blocks silently and does not tell apps which calls were blocked. If a call you wanted is blocked, no app can tell you it happened. So CallShield starts in warn-only: you still see the call, labelled, and keep the decision. Turning blocking on is one tap, and reversing it is one tap.
Where the data comes from
Public complaint data, including the FCC Consumer Complaints dataset (public domain), the FTC Do Not Call complaint feed, and CallShield's own review. No listing is checked with the number's owner. CallShield is not affiliated with or endorsed by the FCC or the FTC.
Healthcare and emergency-adjacent lines on a do-not-block list are held below the blocking threshold whatever the feeds say.
What it cannot do
Most products this page could have imitated leave this section out. It is here because these are the things people are surprised by after they buy.
- It cannot tell you which calls were blocked — iPhone does not report that to any app.
- It cannot recognise a number nobody has reported. A new number is unknown, not safe.
- It cannot stop spoofing. A scammer can display a number that is not theirs.
- It cannot stop a text arriving. No app can. Filing changes which folder it lands in.
- It cannot screen a text from someone you have replied to — iPhone stops passing that conversation to any filtering app.
Privacy
Matching happens on your phone. CallShield does not receive your call history — iPhone does not provide it to any app. The text filter is shown the message it is asked about and sends none of it anywhere; Apple's interface offers a way to forward messages to a server for a decision, and CallShield deliberately does not use it.
Full detail in the privacy policy.
Interested?
One email when it ships. Nothing else. We store your address and nothing else — no IP address, no tracking. See the privacy policy.