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Hey !!! I need help !!! I plugged my Sony hands free on my Xperia m5 and the jack cable broke inside the hole..so a little part of the jack has been stucked into the phone's hole..how can I remove it ?? I can't even reach it...
I'm sorry to hear this. 
I recommend that contact your Local support for assistance with having your device sent in to an authorized service center to have your device repaired.
Let me know how it works out.