Cloudmersive Validate
Validate international phone numbers
Phone
Numlookup
Phone number validation and carrier lookup API with global coverage
Numverify
Phone number validation
Phone Specification
Rest Api for Phone specifications
Phone Validation
Validate phone numbers globally
Veriphone
Phone number validation & carrier lookup
VeriRoute Intel
CNAM caller ID, carrier/LRN lookup and spam scoring for North American phone numbers