They had cell phones in Shiro's time, but they definitely weren't that advanced. The cell phones Shiro knew were about the size of a shoe and had terrible reception, hence why he didn't own one. If they came like that, though, it might be worth it.

He waved Rin off at the offer for more information, though. "Tell me more later," he said, "Getting to the clinic now would be a better idea than talking."

He hated relying on someone else like this, but he also didn't want to bleed out. His stubbornness had a limit.