SM5100B module (not shield) doesn't respond


Iv'e got a bunch of SM5100B modules from eBay in order to experiment. The problem is that the module just doesn't respond.
Iv'e connected it to the arduino using software serial but nothing happens. I replaced the original module that came with the spark fun shield to check the module but nothing.. (i've replaced only the module in order to be sure that the circuitry will not be the problem)

Does any one know if there's a method, software, process that needs to be done to wake the module? If it needed configuration that wouldn't be a problem if only i could talk to it :frowning:

Is it possible i bought damaged goods? (I would like to think not)