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 on the streets, to the left there are some metal tables and chairs, a phone is on one of the tables.
2. As soon as you climb through the house window and enter the bedroom there is a cell phone next to a bedside lamp.
3. making your way across the rooftops, you'll drop down onto a lower roof and there is an ammo crate on your left. Follow the only route possible and into the building - directly in front of you is a phone.
4. You'll be required to jump across a gap and enter into a house - though some green doors (already opened). In the next room is a large staircase. Simply head to the top, and the phone is on the ground before the hole.
