Check out the SmartPea Grocery API.
Real Phone Validation
Real Phone Validation’s API allows users to identify disconnected and invalid numbers. The real-time API uses live telco data - pinging the phone switch - for up to the minute accuracy (no stale database look-ups). Allowing users to determine whether the numbers they are collecting are accurate and contactable. The service also identifies if the number is a landline or mobile, provides phone carrier, and CallerID information.
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