Another fine Krazy Sticky, brought to you by the makers of Krazy Glue®... One of your iPhone speakers may appear to be broken, as you can not hear sound coming out of it. This is because one of the "speakers" is actually not a speaker at all, it is the microphone. Your phone is not broken or defective. It was designed that way. Let's all say it together! "The iPhone has one speaker, and one microphone."