The Internet-connected voicemail server (named "voicemail.my.t-mobile.com" ) behind T-Mobile's customer/web-portal (My T-Mobile) disappeared last week and has yet to reappear. Both URLs for the server on the My T-Mobile account-management pages remain unchanged/updated
and thus a "page not found" (HTTP 404) error results when attempting to check/manage voicemail via T-Mobile's customer/web-portal.
T-Mobile has to date provided no estimate for a return to service, and - adding insult to injury - T-Mobile is continuing to deduct minutes from its "Pay as you Go" customers when those customers use their T-Mobile cell-service to check/manage voicemail while waiting for T-Mobile to fix access to voicemail via T-Mobile's customer/web-portal.
T-Mobile is thus profiting from its own error at the expense of its "Pay as you Go" customers.
Best answer by tmo_amandaView original