Great device, but also with many shortcoming

I bought the tablet for my son, and that the model without 3G. The quality of her a great device, but it bothers me terribly that you can not do some things, do the "cheap" for a device very well. For example, it is not possible dranzuhängen internet stick, with my 99-Euro-tablet works! And for me is the 3G model of the question, because I would like to conclude a mobile phone contract, as we at home have WIFI and just go the contract is too expensive to me, furthermore is also the 3G model at several times as expensive. Nevertheless: The battery is going well and the graphics are great too. I would recommend, if possible, to test the device in advance whether it is suitable for their own requirements and needs.