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What are the emergency numbers for police and ambulance?
General emergency number is xxx;

Fire -198

Police -197

Ambulance -190

What languages are commonly spoken?
The official language is Arabic, French is relatively frequent.
Does Tunisia have freedom of panorama? Can I safely take pictures of official buildings, trains and planes?
Does the venue have Wi-Fi?
Does the hotel have free Wi-Fi?
YES in the lobby.
How easily can I find Wi-Fi in cafes etc?
Where can I find the materials & photos?
See the category on Commons.