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It's worth noting that the most common symptom of an acoustic neuroma is hearing loss. So someone using a telephone frequently would be most likely to notice this and most likely to notice it if it is in the ear to which he (or she, from the picture) holds the 'phone. Not to say that the result may not be true but only that there are significant potential biases.
Case-control studies like this are necessary for looking at rare conditions but they are subject to a lot of bias. Even the prospective study that the article talks of beginning has the problem that the 'phone users select themselves and so are likely to be different from the 'phone non-users in other ways.
I read once that Bocaccio, the Italian renaissance author, died from a cellulitis due to repeatly bumping into a large book he kept in his study. So I have switched to ebooks on my palm to protect myself from that danger. I haven't found an alternative to the cell 'phone yet. Maybe a secretary?
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