Has anyone had any experience using the hopstop itunes/android app in London?
Kristin, They only seem to have a few European cities listed, so I doubt the App would be much use for me. They state in the advertising that users can "Get directions from your current location using GPS functionality". That raised some "red flags" as that function will use cellular data roaming, which could result in expensive roaming charges. Whether your phone will even work in London will depend on which cell network you're with, but you'll need to consider the aspect of data roaming VERY carefully. Happy travels!
Krisitin I had great success with Hopstop in London in May 2010. I had iPhone with AT&T and had no trouble.