IPhone

iPhones were a type of mobile phone on 21st century Earth. Patricia Menzies mentioned them to the Sixth Doctor. (AUDIO: The Crimes of Thomas Brewster)

Courtney Woods had an iPhone, and she used it to post pictures of the Twelfth Doctor on the Moon onto Tumblr in the year 2049. Clara Oswald noted that to the Doctor. Even though he said she couldn't just put pictures of him online he was later able to use the online pictures via her phone to lead her back to him in the TARDIS. (TV: Kill the Moon)

Some used the iPhone to take selfies. (TV: In the Forest of the Night, The Woman Who Lived)

Other similarly named devices from that era included the iPad and the iPod. (TV: Dark Water, A Day in the Death)