Lucifer looks at the phone in Daniel's hand as though the man had just offered him something terribly unhelpful, like a fish.

"My brother and I didn't part on good terms," he says, because that's true enough. The last time he saw Gabriel in this universe, he'd been sticking an angel blade in his chest. Even humans would consider that 'not good terms'. "I haven't spoken to him in some time, so I don't have a number to call."

He turns his head, looking instead out the window, at the scenery passing by far more rapidly than it had when he was walking.

"Last I knew, he was in New York. He may have moved on by now, and if he has... I suppose I'll just have to keep going."

Just keep walking until he finds him.