I loved my Sony Ericsson head phone which I got from my brother. I have recently purchased Sony Xperia U smart phone and really disappointed of the headphone quality which is coming along with the mobile. I was using this old Sony Ericsson headphone earlier and the audio quality was awesome with very good bass reflex technology.
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

There is a converter available for this, however I thought of modifying my headphone(in mic board) instead of using the converter. This is easy with a little bit of soldering. But for this shield has to be disconnected because ground and shield will be connected in pin and in the mic board. In the pin it is not possible to change point at which shield is connected, so when connected to phone with CITA standard shield and Mic are connected. So I disconnected the shield from board. This may be not very good for the quality of sound as noise could be induced.

Modified headphone

A cable with shield

Note: Do not try this if you don't know what you are doing. This may damage your headphone or phone. And may not work for you.