metal types for RF shield?

what type of metals is used for RF PCB shielding that is solderable to PCB and soft(a metal can is used on a RF section of a system and solder that metal to pcb)

what alloy is it?
(like the metals used in mobile cell phones (ex: nokia 3310)

Probably just nickle plated copper or brass. There are some other materials if you need better magnetic shielding. This company does good work:

http://www.photofabrication.com/shielding.php