My iPhone fell down from 2nd floor there are no problems with sensors or screen but, when sim is in or out it writes no connetion. It also doesnot show IMEI number in Settings>General>About. What can i do with this problem? And also speaker doesnot work..

You probably damaged it internally. You may have to take it to a genius bar to have them look at it. Just because it looks ok on the outside doesn't mean the inside didn't get messed up.

Who did you take it to?

This was the advice of an Apple employee? I find it hard to believe.

I would seek the advice of somebody further up the Apple food chain. An iPhone user is not expected to even recognise the term "baseband".

And where exactly was that?

And where was that? I am guessing it wasn't an apple store. Sounds like some 3rd party reseller.

Again something internal is probably broke. A 2 story fall is pretty fatal to most electronic equipment.

So you didn't take it to an apple store yet in another post in this thread you said it was an apple employee? Which one was it then?