The Black Eyed Peas' Will.i.am has said his attempt to tweet during the band's half-time Super Bowl performance was thwarted after he discovered his cell phone had no service.
His Twitter handle was silent until after the game, when he sent out a series of tweets beginning with: "Att crashed ... ahhhh!!!! The worse."
An AT&T spokesperson did not immediately comment on his problems.
Will said in an interview after the performance that his favourite moment of the show was when the band took to the stage by being lowered from the ceiling.
"We were getting beamed down like we came from another planet," he said.
The band sang hits including the party anthem I Gotta Feeling, Pump It and Boom Boom Pow. They were also joined on stage for brief appearances by former Guns 'N Roses guitarist Slash and Usher.
The Peas' frontman sent several tweets before the show, including one that said: "My butterflys are flying around like crazy."
"I'm feeling like I'm on top of the world," he said after the performance.
"It was fresh man," he said. "It felt like cinematic."
He said performing the show with his fellow band members - Fergie, Taboo and apl.de.ap - was an emotional experience. "Playing this show just showed what you can do when you believe in a team," he said.