Overages on Cell Plans: Even with a 10 Gig monthly plan, any teenager can blow that out of the water. If your teen is getting a $200 a month bill, this App could help. Define the known WiFi areas and then set an alert reminder for leaving those areas.
Travel Abroad: There are so many expensive gotchas for traveling abroad. Internationally, your cell plan charges per MB and that adds up quickly considering that one movie can easily be 1 GB which is 1,000 MB.
Even going on a cruise or being in the air could qualify as being out of country and elevated data charges could apply.
So, download Hoogo to help keep your cell phone bill from becoming astronomically huge.