Problem description
From a review of @tanjadegroot :

For the novice user of this API (like me) the description is not sufficient: when do I subscribe to roaming status as opposed to roaming_on/off ? do I need to subscribe in addition to the countrychange event ? or is the roaming status event sent in case of country change ? Maybe to take up for the next release.
would be good to have a bit more explanation beyond just the list of events.

Expected action
Review and enhance the API documentation for all 4 APIs

Additional context