3gs Worse signal than iPhone 4?

my mrs has 3gs, same network etc, have iphone 4, can signal in places can't, both running 5.0.1, @ home have 3-4 bars, gets 2 bars if leaves on window, if lifts gets no service. ideas?

 

different antennas,baseband chip.support more advanced hspa protocol contributing factors iphone 4 1 bar lower ip4s

 

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