It can do almost anything! [IT'S NOT QUITE THAT MAGIC but it sure seems like it to someone from the magical alternate world equivalent of the Victorian era...]

You can use it to talk to other people, for one. Like this! [He'll hold Lily's CereVice out for her to take again before pulling his own back out. After a few seconds of looking for her name in the directory, her phone will be getting a call!]

You just have to hit that little green button to answer it. Give it a try!