There's 10 or more just listed today by one seller. Reason to have one? I dunno, fool your friends, let the kids play with it, nerdy display piece, just maybe just for dummies like me.
a lot of times dummy phones can be good for housing pieces. i know ive had a few dummy phones in the past just in case i cracked or scratched something. also if you wanted to go the painting route, you dont have to worry about your phone being exposed for to long while u wait for paint to dry lol.
