Call Impostor Shield

Grandparent scam, voice cloned by artificial intelligence: before you pay, check that it's really them. An aid to protect you against impersonation: during the call, your loved one's real phone confirms in one tap that they are the one calling you. A voice can be copied. A phone can't.

HOW IT WORKS
1. During a suspicious call, or just after hanging up, pull down Quick Settings and tap the “Check” tile, or the widget with your family's faces, or open the app, then pick the family member who says they're calling.
2. Their real phone asks them right away whether they are the one calling you, or who just called you. The question waits 2 minutes for their answer.
3. They answer “Yes, it's me” or “No” in one tap. “Yes” requires their face, fingerprint or passcode: a stolen phone is not enough.
4. Their answer is signed by a key created in their phone's security chip, which never leaves it. Your phone checks the signature itself: the server can neither forge nor replay an answer.
5. “No”: hang up, someone is pretending to be them. No answer: the app tells you plainly and advises you to hang up, then call your family member back on their saved number, and to make no transfer under pressure.

LINKING YOUR FAMILY
• Side by side: your family member scans the QR code shown by your app. 10 seconds.
• From afar: send an invitation through your usual messaging app, then compare a check code read aloud over the phone. The invitation expires after 24 hours and works only once.
• Your family member needs the app too. Once linked, each of you can check the other, and each can link their own family.

WHICH SCAMS IT HELPS AGAINST
• The grandparent scam, or family emergency scam: a son, daughter or grandchild in distress calls mom, dad, grandma or grandpa and asks for an urgent transfer.
• The voice cloned by artificial intelligence (voice deepfake), which imitates a familiar voice from just a few seconds of recording.
• A call from an unknown number claiming to be a loved one whose phone is supposedly broken.
• In all these scam cases, check that the call is genuine with your loved one's real phone, before paying anything.

NOTHING BUT YES OR NO
• The app will never ask you for anything but Yes or No: never a link, never a code, never money, never personal data.
• A question can only come from a family member you linked yourself. It shows the name and photo chosen at that moment, and always the same sentence, never free text.
• A message asking you for anything else, even in our name, is a scam.

YOUR DATA STAYS ON YOUR PHONE
• No account, no phone number.
• Names, photos and the history of your checks stay on your phone.
• The relay server only passes notifications along. It sees only anonymous IDs, never a name or a number.

WHAT THE APP NEVER DOES
• No call blocking and no automatic detection: your loved one confirms it, from their own phone.
• No analysis of your voice, no access to your calls, messages or address book.
• No location, no ads, no tracking.
• No data sold or shared.

1 MONTH FREE, THEN A SUBSCRIPTION
• 1 month free from installation, no card needed. Then checking a call needs a subscription: €1.99 a month, or €14.99 a year paid for the year, renewed each period (prices in France). No commitment: cancel any time in Google Play, at no cost; access stays open until the end of the period paid.
• Answering your family stays free. Atria.Eponym commits for the period paid only; notifications go through Google and Apple, which do not depend on Atria.Eponym. Terms: atriaeponym.com/impostorshield/terms/en/

A help to check, not a guarantee: when in doubt, hang up and call your family member back on their usual number.

Atria.Eponym, independent developer based in France — [email protected]