I have a BlackBerry 7100 but I can not communicate to any destination mobile.
When my device connects to another mobile, the speaker of that destination mobile will generate a noise, owner of that mobile can not hear any my words. But if I connect to a table telephone, this error does not happend. I don't know why? I think my microphone has a problem. I want to replace this microphone by another, do you know its price?
Thank you!

Did you just get the unit? Should be under warranty if that really is your problem. If you want to replace mic an it's not covered under warranty, then you'd probably have to take whole unit apart (could be wrong if some one knows). I'm not totally clear on your post.

Thank for your support Pharma,
I am living in VN, I bought 7100 from a seller at here so I don't have warranty for it. But I think the problem come from the mic. If you have any idea to fix this error without replace another, please show me.
Thanks in advance