1. Please enter a full phone number, or at least 3 digits(as an area code), or 6 digits(as an area code and city prefix) to determine the location in United States.

2. According to the North American Numbering Plan, the first 3 digits of the phone number can locate state, the fourth to the sixth digits can locate city, meanwhile you can also get some other information such as operators, zip code, etc. we only provide the city location for now, therefore, even if you enter the full ten phone number, we will only according to the previous six digits to locate.

3. At present, we do not provide a service of using the phone number to locate a specific person, which is a privacy infringement.

4. It is not any arbitrary 3 numbers or 6 figures can have accurate positioning, because some may not be used.

5. If you want to learn more rules of North American telephone number, please refer to the Wikipedia - North American Numbering Plan.