Confirm both phone number and address coverage

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Data Freshness: How frequently does the provider update its underlying data sources? Outdated data leads to incorrect lookups.
Algorithm Sophistication: Inquire about their matching algorithms. Do they use fuzzy matching, machine learning, and multiple data sources to maximize accuracy?
Real-world Testing: Request a trial or sample data to test the accuracy and match rate against your own dataset.
Global Coverage:

If your business operates internationally or has a global uganda phone number list customer base, ensure the provider offers robust coverage for all the countries and regions you need to look up. for those regions.
Data Attributes and Enrichment:

Beyond just the address, what other data does the lookup provide?
Line Type: Mobile, landline, VoIP, toll-free.
Carrier Information: For portability checks or specific routing.
Residential/Commercial: Is the address classified?
Geographical Data: Latitude/longitude, time zone.
Confidence Score: A numerical indicator of how confident the provider is in the match.
Risk Indicators: Flags for known fraudulent numbers or addresses.
Integration Capabilities (API):

Ease of Integration: Is the API well-documented? Are there SDKs for common programming languages? Does it offer pre-built connectors for popular CRMs (e.g., Salesforce, HubSpot) or e-commerce platforms?
Scalability: Can the API handle your anticipated volume of lookups, including sudden spikes?
Latency: What are the typical response times? For real-time validation, low latency is critical.
Compliance and Data Security:

Regulatory Adherence: Does the provider explicitly state compliance with relevant data privacy regulations (GDPR, CCPA, etc.)?