Damn noks... you drag me in...

TS... if you are buying 2nd hand item by walk in or cod, maybe you can check the physical condition and functionality based on the particular given to you here rightaway to compare with the offered price... as for this stage, thats the only guide you have and what you should know... once that beauty is in ur hand, then talk again bout how to brick ur iphone in a fastest and effective way *lol*.... btw, suitable and competible apps can be dicussed later which is always self explanatory. e.g. "This apps is only for firmware 1.1.4"...

P/S: Are you sure you're wearing a right tag?

And a lil bit of an off-topic question