Many US iPhone 4S owners are reporting an outage of Siri, the device's integrated voice command system. "I'm really sorry, but I can't take any requests right now. Please try again in a little while," reads one error message triggered by asking a question. Another is similar, but begins with "There's something wrong, and I can't answer your questions right now."
Although the main requirement for using Siri is a 4S, it also has to communicate with Apple servers, where the actual processing of questions takes place. The service could therefore be suffering overload, but the problem might also be attributable to a glitch with the servers themselves. Apple has yet to comment on the situation publicly.