UPDATE: All fixed.
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A developing story, Gizmodo’s updates:
Update 1: Several commenters are reporting that both incoming and outgoing calls are working if routed through Google Voice.
Update 2: Many reports that T-Mobile @Home is out as well.
Update 3: We got a note from a T-Mobile spokesperson:
We’re making good progress restoring voice and messaging service to affected customers. At this time, approximately 5 percent of T-Mobile customers are experiencing service disruptions. Issues began at approximately 5:30 p.m. Eastern time. Our rapid response team is working continuously to fully resolve this disruption. We sincerely apologize for the inconvenience that this has caused our customers
Follow updates via Twitter or the T-Mobile forums.
Endgadget chimes in, “particularly bad timing in light of the recent Sidekick drama.” More discussion via Techmeme.