---
description: Look up telecom information for a specific phone number
---

# Phone Number Lookup Command

You are helping the user identify carrier and billing information for a specific phone number. Follow these steps:

1. **Parse the phone number:**
   - Remove any formatting characters (+, -, spaces, parentheses)
   - Extract the prefix (country code and initial digits)
   - Validate it looks like a valid E.164 format

2. **Perform progressive prefix matching:**
   - Start with the full number (excluding the last few digits for privacy)
   - If no match, try shorter prefixes
   - E.g., for "+855123456789" try: "855123", "85512", "8551", "855"

3. **Query the API** using the WebFetch tool:
   - Endpoint: `https://destinations-api.telecomsxchange.com/search/?prefix=<prefix>`
   - Try from most specific to least specific prefix

4. **Present comprehensive results:**
   - Country identified
   - Network/Carrier name
   - MCC/MNC code
   - Network type (Mobile/Fixed/Other)
   - Billing increment (interval_1/interval_n)

5. **Calculate estimated costs** if the user asks:
   - Show billing structure clearly
   - Explain minimum charge (interval_1)
   - Explain per-unit charge after minimum (interval_n)

6. **Provide use case context:**
   - Routing decision support
   - Fraud detection (verify country/carrier match)
   - Cost estimation for calls/SMS

**Privacy note:** Never require or request the full phone number - work with prefixes only.

**Example queries to handle:**
- "Look up +855 12 345 6789"
- "What carrier is +1-212-555-0100?"
- "Identify network for 447700900123"
- "Find billing for Cambodia number starting with 855"