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As you might expect, the outdoor locations largely saw better 4G coverage for the Mi-Fi unit and mostly delivered faster download and upload speeds than indoors.
However, there were a number of examples where that wasn't the case - where upload speed was faster than the download, or where indoor speeds seemed better than outdoor.
For example, the image above shows the results for Old Street, Shoreditch - home to Tech City. The outdoor test showed results of around 15Mbps up and downstream, and a ping time of 41ms.
The indoor test, performed about 20 feet away from the outdoor test, returned download speeds of around 9.5Mbps and upload speeds of 2.36Mbps. Despite the decrease in reception and speeds, the ping result was actually faster than outdoors, at 26ms; this was also the case in some of the other tests in multiple locations that returned lower indoor speeds than outdoor.