Why are mobile phones prohibited at many consulates?
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Accepted answer
You can take pictures, which:
Show the internal layout, where people sit, etc.;
Show the people that work there, which allows to identify them,
It could be a remote bomb - you just leave you cell lying under the chair or wherever, and later remote detonate it;
It would be incredibly annoying if you have dozens of people in there, all shouting on their cell phones, mixed with oh-so-funny loud ringtones, and so on.