Are you referring to the power button or home button when you say "iPhone 4 button?"
If power:
Did you happen to notice if the small black "nub" in the image below was on the actual power button itself when you removed and replaced it? If not, this is the likely issue that is preventing you from hearing the "click" that we are all so used to.
http://guide-images.ifixit.net/igi/UvFsC...
In regard to people not being able to hear you a lot of people disagree about what causes this issue but you may find it helpful to review the link below for a possible solution, diagnose and also a workaround utilizing the accessibility options.
Microphone not working when making/receiving calls
Referencing the "nub" on the power button is from past experience. I actually just experienced, and resolved, this same issue.
The other thing you need to make sure is that each wing of the power button is centered over it's pilot.
In the image you'll notice the right side being lifted up has a hole. On the left, you can see that there is a very small peg that it fits over. Make sure these are each lined on either side.
This will properly center the power button on the cable to the external button and will bring the click back.
I would definitely make sure all connections are clean. Also clean the connections on the ear piece (the two copper contacts behind it) and make sure they are bent properly as you can find in the images about the removal of it.
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