A shell for a portable telecommunication system (3) comprises a surface defining a hollow volume, suitable for being mechanically connected in a removable manner to a portable telecommunication system (2), said portable telecommunication system (2) being able to be inserted, at least partially, in the hollow volume, said portable telecommunication system (2) comprising a memory suitable for storing a computer document, the shell being characterized in that it comprises a communication unit suitable for receiving a document stored in the memory from the portable telecommunication system (2), and a miniature printing device (1) for documents, suitable for receiving said computer document via the communication unit and for printing same.