Nick Bylsma

Corrected entry: In the London tube station, Matt Damon buys a mobile phone from a stand and puts it in the journalist's pocket. Matt Damon calls it and starts giving him directions. Since cell phones take a while to activate, this would not be possible.

Correction: He buys a pre-paid cell phone from the stand. These types of phones are activated as soon as you pull them out of the box and enter in the phone card number.

Nick Bylsma

In some countries, like Germany, you have to go through an activation process that ties your identity to the phone number, but in others, you can use it immediately.