This Video explain How to Check Cellular Data Usage on iPhone. The smartphone revolution has evolved the way people communicate and obtain in touch. The advent of social media sites and communications apps like Skype, Hangouts, Viber, WeChat, and Facebook Messenger allows users to talk in real-time without cost. Emails are actually readily available on mobile, so that you do not need to wait and sit looking at a PC simply to download and open your month-end report. If you are not using a Wi-Fi connection, these browsing, downloading, and chatting requires mobile data use. If you are not enrolled in unlimited data service, you might need to monitor your mobile data usage to prevent additional charges in your account.