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On the iPhone this actually seems quite good from my testing. I can view an area and then if I fudge the app to not use the internet for location lookup and turn off networking it still displays the map fine.
I do note though that OpenLayers 2.12 has some chachine hooks added to the API so we can possibly use those. However, if the built in cache is good enough(tm) then I'd be tempted to rely on that.
This issue has moved to mysociety/fixmystreet-mobile#18