The UN's International Telecommunications Union has announced that the number of Internet users worldwide is now Perhaps even more surprising is the current number of cell phone users. According to the ITU, mobile subscriptions have exploded to five billion, up from only 500 million at the start of 2000. Conversely, fixed landline telephone subscriptions fell for the fourth consecutive year to 1.2 billion. It's worth noting that some people have multiple cell phone plans so each subscription doesn't equal one person, but that's still a massive number any way you look at it.