How to disable the voice mail icon from my iphone 4s?

Hi, i'm with 3 ireland and they charge for their voicemail service. Because of this i've diabled the service but occasionally i press the voicemail icon on my iphone 4s (by mistake) and have been charged for it. I've contacted 3 and they said that although i have disabled the service, i will still get charged for ringing it. Anyone know how to disable/remove the voicemail icon from the device?

You can't.

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