The website SMSMatrix.com finds the carrier associated with a mobile phone number. FreeCarrierLookup.com and CarrierLookup.com also identify mobile number carriers; however, they only allow for a limited number of free lookups. These paid sites also identify if the phone number belongs to a mobile or landline phone.
A carrier lookup tells the name of a mobile carrier based on the phone number. Some free lookup services sometimes give wrong information. Since all carrier information is based on a large database of phone numbers, its possible that information can be incorrect. Because of this, it is recommended to use two or more different websites to look up a carrier including paid sites.
SMSMatrix is one of the only carrier lookup websites that allows for unlimited free lookups. The drawback to this website is it only supports North American mobile numbers, not landline or international phone numbers. SMSMatrix requires no registration or information besides a Captcha for verification.
Both FreeCarrierLookup.com and CarrierLookup.com work across North America and most of the world. They both only allow for a limited number of free lookups. Free Carrier Lookup has a $12 monthly subscription service with a $0.006 per lookup, while Carrier Lookup has a flat rate of $0.01 per lookup, both of which are purchased in multiples of 1000. Free Carrier Lookup supports some international numbers and ported phone numbers, but both SMSMatrix or Carrier Lookup only support numbers from the United States and Canada.