APN stands for Access Point Name.
A mobile device making a data connection must be configured with an APN to present to the carrier. Your home carrier automatically enters an APN and on KnowRoaming, you must configure a unique APN.
You need to set up the KnowRoaming APN when you would like to use data to access your internet, email and apps while abroad. For instructions on how to set up your data, please see the data FAQ section.