There are two ways to find out whether you’ve received a call from a landline or mobile number. The first method is to use any phone number validator, which is a tool that can be found online. Apart from confirming a number’s legitimacy, the validator will provide additional details such as the connection type. The second method is a bit old-fashioned – look up the number in a landline number directory. If it’s not there, then it’s most likely a mobile phone number. This method isn’t the most reliable, though, as you may simply own an outdated phone book. In some countries, cell phone numbers and landline numbers have different prefixes for easier identification. However, that’s not the case for North America.