The latest articles on DEV Community by Martin Scherbaum (@martin_scherbaum_bbfd151f). https://dev.to/martin_scherbaum_bbfd151f https://media2.dev.to/dynamic/image/width=90,height=90,fit=cover,gravity=auto,format=auto/https:%2F%2Fdev-to-uploads.s3.us-east-2.amazonaws.com%2Fuploads%2Fuser%2Fprofile_image%2F4160263%2F57e8503f-8e8f-4e8e-a617-f48223d04458.png https://dev.to/martin_scherbaum_bbfd151f en Martin Scherbaum Sat, 03 Oct 2026 17:58:44 +0000 https://dev.to/martin_scherbaum_bbfd151f/testers-wanted-keepcallssafe-blocks-hidden-number-calls-before-they-ring-android-10-4cbm https://dev.to/martin_scherbaum_bbfd151f/testers-wanted-keepcallssafe-blocks-hidden-number-calls-before-they-ring-android-10-4cbm <p>Hi! I've built a small Android app that rejects calls from hidden/withheld numbers before the phone rings. Optionally it also blocks international numbers that aren't in your contacts, with countries you always allow. Contacts always get through.</p> <p>Everything runs on the phone: no ads, no account, nothing uploaded.</p> <p>It works on our Samsung and Xiaomi phones. I'd love help from people with Pixel, Motorola, OnePlus, Oppo, Realme, Honor or older phones (Android 10–12).</p> <p>Testers get a free lifetime licence. Testing takes about 15 minutes: ask someone to call you with a withheld number and tell me what happened.</p> <p>Details: <a href="https://keepcallssafe.com/en/testers.html" rel="noopener noreferrer">https://keepcallssafe.com/en/testers.html</a><br> Or email <a href="mailto:support@keepcallssafe.com">support@keepcallssafe.com</a> with your phone model and the Gmail you use in the Play Store.</p> android mobile privacy showdev