QOS features cell phones scattered around the levels of which you can pick up and gain additional information.The phones omit a tone when you are close and flash. You simply highlight them press X or Square and you'll see what details it has given you - often being helpful for the mission you're on. The cell phones info is ordered from earliest to latest. So if you pick one up and there's a gap in the list, you've come too far and need to go back if you can and find the missing phone. You can press the Back button at any time to to see what cell phones info you have gathered. if you die before reaching a checkpoint you'll have to grab the phones again.
CELL PHONES
1. As soon as the mission begins go into the next compartment on your right.
2. Once you drop down into the carriage from the roof there is a ladder and a cell phone on the right of the ladder (your left if you used the ladder to enter the carriage).
3. You'll be required to jump across to a freight train, as you move through the carriages on your right next to the first ladder you will climb is a cell phone.
4. Once you re-enter the passenger train you'll work your way through the carriages. There is a cell phone on a crate directly in your path (2nd carriage).
5. You'll climb onto the roof of the train again and then drop down by a ladder. The phone is behind you here.
