First thing: grammAr, not grammer. Here's my rewrite. A couple of times I sensed you hadn't fully grasped the meanings of some words you chose. ''One of the principal advantages of using the internet, mobile phones or any other kind of portable networking device is that you are able to acquire a massive amount of information, such as news, business information, technological knowledge, historical documents or anything else you would ever need." ...not to mention the latest goss! :)

Just two remarks : - I am not certain that this is incorrect, but to me it doesn't sound right to say "acquire massive information" ("massive" is usually used for referring to a big object : massive castle, massive mountain ) . I would replace it with something like "acquire all kinds of information" or "acquire lots of information". - add "may" in "everything you may ever need".