I have a friend flying in at 6am to terminal C at IAH. They don’t have a working phone # nor do they have an uber/lyft account. I was referring to this fly2houston website for info on taxi services, but does anyone have more recent experiences with getting a taxi from IAH this early in the morning? Or do I have to book one in advance? Any help is appreciated.

I have a friend flying in at 6am to terminal C at IAH. They don’t have a working phone # nor do they have an uber/lyft account. I was referring to this fly2houston website for info on taxi services, but does anyone have more recent experiences with getting a taxi from IAH this early in the morning? Or do I have to book one in advance? Any help is appreciated.