For the casual smartphone user, it can be a bit tricky to identify which settings do what or how to access something that you might need to change. Occasionally, you may need to switch a setting to get data service, add a proxy, tether an email service or otherwise. One of the settings everyone who travels should know about is the APN.

If you’ve purchased your phone from a telecom provider, chances are your phone is locked. A locked phone is one that will only work on the network that it has been locked to, meaning that you can’t use a SIM card or services from another provider. Companies do this in order to secure your business for an extended period of time, as it ensures that you will not use the device you purchased from them on another network