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But the volume buttons are not lower in the iphone 4s.How can that need this case?

AT&T bumpers from the IPhone 4 will not work on the 4s. verizon cases will work. All case manufacturers by now should have labeled their products as 4/4s compatible. once again:

att iphone 4 cases: no
verizon iphone 4 cases: yes

although if your a real cheapskate the att iphone 4 cases will work youll just struggle hitting your side buttons as they wont fit in their designated slots
 
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I purchased my bumper for my new 4s and it fits great . I love the look. I went from bulky case to bumper and zagg back.
 
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