There have been many threads in relation to the fact that one of the speakers on the bottom of the iPhone does not work.
The reason for this is that there is only one speaker on the bottom of the iPhone. The other hole that people often confuse for a speaker is the microphone.
Even though these pictures depict the 3G iPhone the same applies to the original iPhone.
Click to enlarge


iPhone 4 (speaker is located on the other side to the previous versions)

See guide entry
The reason for this is that there is only one speaker on the bottom of the iPhone. The other hole that people often confuse for a speaker is the microphone.
Even though these pictures depict the 3G iPhone the same applies to the original iPhone.
Click to enlarge


iPhone 4 (speaker is located on the other side to the previous versions)

See guide entry