President Sarkozy got to grips with the Teorem phone, which looks like a regular smartphone, while on a visit to the Thales Communication factory in Cholet, western France.
Some 20,000 such devices will be distributed to the president and his entourage as well as government ministers and their advisers early next year. Top military officials will also use them.
The superphone's designers said the phone "guarantees a very high safety level," and has the added advantage of being able to use commercial mobile networks or fixed secure lines.
"It's beautiful", the president could be heard saying during the visit.
Shortly after Mr Sarkozy's election in 2007, workers in the offices of the president and prime minister were reportedly ordered not to use handheld BlackBerry devices, amid fears that foreigners could spy on them.
Security services were said to be worried because BlackBerry phones use servers based in Britain and the US, which they feared could be intercepted.
The ban was reported to be only a partial success.
Research In Motion, or RIM, BlackBerry's Canadian makers, responded that its encryption system was "the most secure wireless data solution available", saying that it had been approved for the transmission of sensitive data by the UK government and by Nato.
Thales' 2008 Press Release on the TEOREM secure mobile phone
I wonder where they got the name ;)
In geometry, Thales' theorem (named after Thales of Miletus) states that if A, B and C are points on a circle where the line AC is a diameter of the circle, then the angle ABC is a right angle. Thales' theorem is a special case of the inscribed angle theorem.