I downloaded the Tour de France app, its quite good although you have to pay 69p for it. It has photos and live updates and if you are going to France to watch a stage it will tell you when the riders and caravan are due to come through certain sections.

I noticed at the bottom there was an Official Game - it cost £1.99 to buy the app.
You load a game, choose a team (1 of the present Pro Tour teams in this years Tour) and it selects 5 riders for you to manage.
I chose Liquidgas and entered my name Peirrer Pan Aux Oeuf.
Then you play the stage - it takes  2-3 minutes to play a stage through and you select your riders to attack, team sprint, sprint, stop pedalling. Other riders will attack and you can decide to go with them or hang back. Chasing everything will decrease your riders energy, if you don't use them strategical, you'll be out of luck and off the back by the middle of Le Tour.

The game presents you with various challenges for each stage e.g.
'create a breakaway group', 'finish in the top 30 for a stage' 'win a stage with the fighter'.

It is good to begin with, sometimes my fingers wouldn't select the right buttons and didn't realise the final sprint was coming up and missed it on the opening stages.

After several stages your riders become tired and their energy bars drop. So they can't keep up so well on the climbs as their manager you'll need to strategically increase their energy using recovery points you've earnt over the stages by completing the challenges.

After a while it all gets rather boring and not very true to life. On one of the mountain stages Mark Cavendish attacked and on another day Vinokorov went after about 25k on a long flat stage.

on my first trial play, I end up winning the Yellow and the Green jerseys. Nibali taking the Mallot Jaune by over 25 minutes from my team leader Ivan Basso who was a further 5 minutes ahead of the next GC rider.

Its fun, you don't need any 3G or Wifi connection to play. But it also isn't very hard or realistic.
I think it is suitable for kids rather than seasoned followers of Le Tour.