I bought this phone for these features shock resistance and especially for his autonomy. The sound quality during a conversation means remains for me but it suits me. Nevertheless, I appeal to the Amazon after 3 months of lassitude which carried out the exchange of the phone very quickly because the rear locking screws opens quickly, all alone during transport, and creates a metallic sound to open the screws. This problem unfortunately persists with the second phone and I fear that this is a problem in the design of this locking system. Even at the height by tightening the screw opens easily just by turning it with your finger! There are no mechanical locking system on this model unlike the B2100. I am still waiting a response from Samsung to whom I reported this persistent problem on the second received phone.
