Once you get your HE location setup correctly then you'll probably want to combine a couple of sources of Presence so that they become more reliable and available via a single App such as
Personally I use a combination of the HE presence + Locative (an iphone app) + iphone WiFi presence (App)
There is several other combining apps such as;
[RELEASE] Presence Plus - Creates a combined presence device, taking back control of the 'last activity' data!.
Search the forum and you should find something that will work for you. 
