With a modem and a wi-fi router you can create a signal without having to have a computer or wi-fi capable device. This would probably be a scenario if it was a hot-spot or free wi-fi for customers. As for getting a wi-fi connection with out a computer, it all depends on what you a classifying as a computer. A smart phone or tablet can be considered a computer as most of them can do the same things. It’s just that they are smaller and more portable.