An interesting article on Android users in the US not getting upgrades to their phones. Basically most users are at least 2 versions behind. This is in stark contrast to iOS users who get minor and major updates for at least a couple of years.
How are NZ Android users getting treated?
http://news.cnet.com/8301-1023_3-20126547-93/android-owners-getting-stiffed-on-os-updates-study-claims/?tag=cnetRiver


