The little shift in Mute & ON/OFF buttons in iPhone 4S that makes it different from iPhone 4 could cost you extra $$$ or an inconvenient Case if no attention is paid when ordering a Case..
I also think that some iPhone 4 external power packs in the market will have same Mute & ON/OFF problems when used with iPhone 4S..
Q Power have released a new power pack tasted on iPhone 4S
VIDEO REVIEW
http://www.youtube.com/watch?v=BDM2knLnNuA&feature=mfu_in_order&list=UL
I also think that some iPhone 4 external power packs in the market will have same Mute & ON/OFF problems when used with iPhone 4S..
Q Power have released a new power pack tasted on iPhone 4S
VIDEO REVIEW
http://www.youtube.com/watch?v=BDM2knLnNuA&feature=mfu_in_order&list=UL