Help Call problem when I lie down and talk

[GSBDCLXVI]

Just bought the Samsung galaxy S2 2 days back and I am experiencing a strange problem. Whenever I call someone in standing or sitting position, the other person(on call) can hear me properly but when I lie down my voice is hadly audible but I'm able to hear everything properly.
And this problem doesn't occur due to the network.I tried it using different sims.

Is it some hardware problem?

Plz help.

 

[sam142000]

That's a really strange problem.
All that I can suggest is try turning off the auto rotate when you lie down and talk.
Maybe that would help.

 

[GSBDCLXVI]

Tried it...still the same problem...so I guess it's a hardware problem?...Will they replace my phone?..