Its possible to unlock your sony ericsson using the codes...Get the unlocking code for your mobile from theunlockspot.com .After getting the code, you may follow the instructions at http://www.mobileunlockguide.com/sony-ericsson-k750i .It helps to unlock your mobile easily.
harshini
May 2012
go to site, www.sonyericsson.com/support. they have code's like, oooo. that might help to get your phone working again.
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Try fixfault.com to fix mobile phones.