Last night there was a T-Mobile outage. Problems started around 5:30 p.m. EST.
Te outages occurred in several regions. T-Mobile customers from Atlanta to Los Angeles complained about the outage on web forums.
Today the T-Mobile Forum notes:
PDATE 11/04/2009 9:15 AM PST:
T-Mobile confirms it has fully restored voice and text/picture
messaging services for customers affected by intermittent service
disruptions on Tuesday. About five percent of our customers across
various geographies were affected for much of Tuesday evening, and by
late Tuesday PST their service was restored. Our sole focus has been
restoring full services for all customers; we are now investigating the
root cause of the incident. We sincerely apologize for the
inconvenience that this has caused our customers.
If you continue to experience difficulty making/receiving
calls or accessing data services, please power your phone off then back
on. This will update your connection to the network and should restore
your access to these services.
The last T-Mobile outage happened when Sidekick users lost their data.