Apple iphone application includes hidden tethering

An iPhone developer has acknowledged that a recent update to one of his apps includes the hidden ability to tether the smartphone to a laptop, circumventing carrier fees for the service.

By tethering a smartphone to a laptop, users can share the phone's cellular connection to the Internet with a notebook. Carriers typically levy additional fees for the service: AT&T, for example, charges customers an extra $20 per month for tethering an iPhone, although as part of the deal it also boosts the allowed data usage from 3GB to 5GB.

Although QuasiDisk is billed as a "simple file manager and file viewer" that lets users load files, documents and photos from a third-party FTP server or sync data with a remote device using Apple's own iCloud, it also can be used for tethering, Simpson said in his instructional video.

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