We don't have a specific API solution that's best or cheapest for UK phone numbers. However, we offer several integrations that can help with phone number validation and retrieval:
1. Trestle: Offers a Phone Validation API to verify and grade phone numbers in real-time.
2. BetterContact: Enables finding mobile phone numbers for contacts.
3. Firmable: While primarily for Australian numbers, it can retrieve mobile phone numbers using social URLs.
To find the most suitable option for UK numbers, could you tell me more about your specific use case and volume requirements?
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