Definition: In this task, you are given a news article. Your task is to classify the article to one out of the four topics 'World', 'Sports', 'Business', 'Sci/Tech' if the article's main topic is relevant to the world, sports, business, and science/technology, correspondingly. If you are not sure about the topic, choose the closest option. Note that URLs in the text have been replaced with [Link].
Input: Mobile Phone Users Double Since 2000  GENEVA (Reuters) - Mobile phone subscribers around the  globe totaled nearly 1.5 billion by the middle of this year,  about one quarter of the world's population, the International  Telecommunication Union (ITU) said on Thursday.

Sci/Tech