Beds make no sound when placed (fixed in 0.16.0, however they have the incorrect sound of stone as opposed to the wood sound). When walked on or broken, they make stone sounds. This bug was fixed on the PC version (MC-66347), so I don't see why it shouldn't still be in the pocket edition.
And yes, I searched before making this.
Confirmed on Samsung Galaxy Note 3. Android 5.0 Version: 0.12.1 Beta 13