Well, that's disappointing. About a year ago, I came within inches of purchasing service with Phone Power.* At that time, they claimed they were just finalizing the details on how they'd make their service available to SIP credential needing mobile devices like the Internet Tablets.

I haven't looked at their site or forums since, so I'm going to guess some blocker appeared that caused them to rethink their plans. However, if they're still saying they're only weeks away from supporting devices that require knowledge of those SIP credentials, I'd advise taking it with some hefty grains of salt.

* As in, I bought a phone adapter and ventured through most of their web-based, bring-your-own-device ordering process multiple times, credit card at the ready, only to be stopped each time by form errors.