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When mobile users surf the Web they also may be inadvertently disclosing their phone numbers, a security researcher said Thursday.
The problem lies in the way that some networks are reformatting Web data on what are known as proxy servers, which are used to help Web sites display properly on the tiny screens of some phones. According to Collin Mulliner, a graduate student at the Technische Universitat Berlin, some operators are reformatting Web data they send to Web sites too, and adding sensitive customer information, such as phone numbers, which can then be logged by Web publishers.
Mulliner, a self-described mobile phone hacker, discovered the problem by reviewing his personal site's Web server logs and studying a large number of HTTP (Hypertext Transfer Protocol) headers from mobile carriers.