Iphone 3gs only works on speaker?

I have an iphone 3g. With screen, lcd & volume button broken, somebody want To sell me An iphone that when youre on. Call only works on speaker, ut The outside is perfect. If i buy it can I Just replace the microphone from he cracked phone?

Its probably stuck in headphone mode. Just keep inserting headphones in and out until it pops out of that mode.

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