Hi @ara6, let me see if I can help hot here.
Your question has been translated to English as this is an International forum, please post any replies in English and it will be easier for me and other users to assist you.
I am not really sure on what you mean by "voicemail icon", But if you want to disable the Xperia Answering Machine, Find and tap Setting s > Call > Xperia Answering Machine > Tap the slider in the top right corner to disable the function.
I hope that helped. Please return if you have further question or if I have misinterpreted your question in any way! 
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