....recent reports from Trusteer would suggest so. After gaining access to web server logs from phishing sites they found that:

• Mobile users are the first to arrive at phishing sites
• Mobile users accessing phishing websites are three times more likely to submit their login info than desktop PC users
• Eight times more iPhone users accessed these phishing websites than BlackBerry users

Interesting possible reasons why, ranging from smartphone users having a different cultural attitude to phishing emails through to issues around the smaller screen real estate not able to give as many hints that an email may be a phishing attack.

More here.