Please Be Aware that No 3rd Party Headset with Mic will work with Xperia X-10.
Its another crap decision from sony ericsson to not to follow industry standards in 3.5mm Jack Channel design
Now what do you mean by " Will not work " ? I used the wired headphones from my Nokia n95 8gb, Iphone 3g and it worked just fine.. BUT I was not able to hangup after the all was done. Other than that it was fine.
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