Today I completed Bourne Trilogy and noticed a thing very interesting. They used Motorola as cell phone for each person in the movie which is very impractical. I have seen such thing in other movies also. Motorola as cellphone for each cast is shown in Don and Audi in transporter movie series or Aston Martin in Bond series. So is it done to promote the products thorough the films? Or do the companies sponsor the films?
Motorola was a huge sponsor of the Bourne Trilogy, even doing an advanced screening of the films for VIPs. This article from TechDigest chronicles all of the high tech product placements in Bourne Ultimatum. Sadly, product placement is becoming so blatant that it is becoming distracting!
As you say, it is done to promote the products by associating them with certain types of characters.