Sony(Sony ericssion) mobile headpone compatibility problem solved
So I thought of using the old one with my Xperia U. But I found that the headphone is not supported. After a little research, I found that the new mobile phone series Sony Xperia S, Xperia P and Xperia U, Z and latest uses a different 3.5mm headset standard compared to the older Xperia models from 2010 & 2011.
3.5mm jack OMTP, CTIA and ordinary sterio
The spec sheet for the 2012 Xperia models highlight that the 3.5mm jack will now use the CTIA standard as opposed to the OMTP standard it was using previously.
1249-0456 EC250 Headphone Converter
Modified headphone A cable with shield