Call Screen

Why It Exists

Users receive increasing numbers of spam, scam, and unwanted calls that interrupt daily life and pose fraud risks. Manual screening is time-consuming and error-prone.

How It Works

Call Screen is Google's AI-powered call screening system that runs on Pixel devices using on-device Gemini Nano models. When an unknown caller is detected, the AI assistant answers the call, asks the caller to state their purpose, transcribes the conversation in real-time, and presents a summary to the user. The system can identify and automatically decline spam, scam, and robocalls. All transcription and caller analysis happens entirely on-device on supported Pixel phones, preserving privacy while protecting against fraud.

Everyday Use Cases

• Spam call filtering
• Scam call detection
• Unidentified caller detection
• Call transcription
• Do-not-disturb automation
• Business lead qualification

User Workflow

• Suspected spam call arrives
• Gemini Nano analyzes caller number and behavior
• If screening is needed, AI answers and asks caller to state purpose
• Conversation is transcribed on-device
• Summary and caller intent are presented to user for decision

AI Processing Flow

Incoming call numbers are checked against Google's spam database. On-device Gemini Nano models analyze call patterns and metadata. For suspicious calls, the AI assistant answers with a natural voice and asks the caller to identify themselves. Real-time speech-to-text transcription runs on the Tensor NPU. The AI classifies the call intent and urgency. Users receive a real-time summary with a recommended action.

Inputs / Outputs

Inputs:

• Incoming phone number
• Call timestamp
• Caller history
• Call transcript audio
• Spam database lookup
• Device context

Outputs:

• Call category label
• Real-time transcript
• Caller intent summary
• Recommended action
• Spam blocking
• Synced report

Known Limitations

• Relies on Google's spam database which requires occasional updates
• Accuracy varies by accent and background noise
• Available only on Pixel phones
• Some legitimate calls may be incorrectly flagged

Unsupported Scenarios

• Emergency services calls
• International calls with unsupported languages
• VoTP calls from unsupported carriers
• Calls from withheld numbers
• Conference bridges

Performance Notes

Call screening decision made in under 500ms; Real-time transcription with under 200ms latency; Spam detection accuracy over 95 percent; NPU power consumption under 1 percent per screened call

Available On

Shows where this feature is available and how its AI processing works on each platform. Availability may vary by device.

Research Status

Confidence and verification reflect how complete documentation is. Fields may show Not assessed or Not yet verified while research is ongoing - this flags gaps, not product deficiencies.

Research Notes

Available on Pixel 4a 5G and newer; Enhanced with Gemini Nano on Pixel 8 Pro 2023; Requires Google account for spam database; Introduced at Google I/O 2019; Now supports 15 languages on-device

Details

Capability Mapping

This feature maps to canonical capability family: Translation.

Canonical capability: Message Translation.

• Message Translation - Translates text messages between languages.

Grounded in 15 device(s) on Gemini Nano.