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Using your mobile phone in Tunisia can prove very expensive. Even receiving calls and texts will cost you and you can very quickly run out of credit.
There are various public telephones scattered around, some may have a title of 'taxiphone' but they are all the same. Mostly, they are in little out buildings with a few booths in. It's just the same as any other public telephone, insert money, dial (using the appropriate international dialling code) and away you go.
This is a much cheaper method than using a mobile telephone - 5 mins to UK mobile cost under £2.
If you want to make an international call from your hotel, you may have to wait until lines become available which could be several hours.