Lol. I'm not as bothered. Tomoyo gave Sakura and Kero cell phones in the original. Maybe Tomoyo's mom upgraded them.
To me, it's way more bothersome in series that continue for more than five years that want to keep up with the tech. You'd hate Detective Conan (Case Closed). It's been going on so long (since the 90's) that there were giant block cell phones and a case that required a fax machine early in the series. Now they all have iPhones. And the author insists that it's still been less than a year in manga time.