Step-by-step guide to blocking spam calls on Android phones using built-in screening, Google Phone app, and third-party blockers.
Pixel phones feature Call Screen — tap "Screen call" when an unknown number calls, and Google Assistant answers, asks who's calling and why, and shows you a real-time transcript. You can then decide to answer, decline, or mark as spam. On Pixel 6 and later, you can enable automatic call screening for suspected spam numbers.
Call Screen is exclusive to Pixel phones, but Google's Verified Calls feature works on all Android phones with the Google Phone app — it shows the caller's name, logo, and reason for calling before you answer (for participating businesses).
On Samsung phones: open the Phone app > Recents, long-press the number you want to block, and select "Block number." You can also go to Phone app > Settings > Block numbers and enable "Block unknown/private numbers" to silence all calls without caller ID.
Samsung's Smart Call feature (powered by Hiya) is built into many Galaxy devices. It identifies unknown callers and flags potential spam. Enable it at Phone app > Settings > Caller ID and spam protection.
On Pixel phones: open the Phone app, tap the number in Recents, select "Block / report spam." Go to Settings > Blocked numbers to manage your blocklist. Enable "Unknown" to block calls from numbers not in your contacts.
Pixel's integration with Google's spam database means suspected spam calls are automatically labeled in your Recents. Combined with Call Screen, Pixel phones offer the most comprehensive built-in robocall protection on Android.
Truecaller (free, premium $2.99/month) — the most popular caller ID app globally with 350+ million users. Identifies unknown callers using a community-sourced database. Hiya (free, premium $3.99/month) — provides caller ID and spam detection with lower privacy concerns than Truecaller. Nomorobo ($1.99/month) — focuses specifically on robocall blocking with high accuracy.
Note on privacy: Truecaller requires access to your contacts, which it uploads to build its database. If privacy is a concern, Hiya and Nomorobo are better choices as they don't require uploading your contact list.
Every major US carrier offers free spam protection for Android: T-Mobile Scam Shield (automatic for all customers — blocks the most likely scam calls and labels suspected spam), AT&T ActiveArmor (download the app, free tier blocks fraud calls), and Verizon Call Filter (download the app, free tier identifies and blocks spam).
For the strongest protection, layer multiple defenses: carrier spam filter (network level) + Google/Samsung built-in screening (device level) + one third-party app (database level). This three-layer approach catches the maximum number of robocalls.
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