There is now one mobile phone for every two people in the
world [5]. As such phones become more powerful and sophisticated,
users have started to use their phones as personal information
processing tools rather than simply for making phone calls.
At the same time, the rise of cloud computing means that resource
constraints on a smartphone can be alleviated by offloading computation
to the cloud. Mobile cloud computing [9] has thus arisen
as a means for improving the capabilities of mobile devices. But
one large constraint for the mobile cloud is the requirement for Internet
connectivity. This is a concern in challenged environments
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