“We’ve been told by a trusted source that the long-awaited AT&T iPhone-as-modem tethering plans (preliminary details in MacBlogz’ post from November: 5 GB data cap, $30/month supplementary cost) may be ready for prime time during Macworld Expo,” Michael Rose reports for TUAW.

“While $30 is a steep charge on top of an iPhone data plan, it’s still cheaper than the $60 you’d pay for an EV-DO or HSDPA card plan for mobile data; for some users it may make more sense than a standalone device,” Rose reports.

Full article here.