I have a Galaxy S4 mini which you can use as a hotspot. And Claro won't charge me extra for activating this tethering function. It will offcourse consume my gigabytes, for which I pay S/. 45 for 2 GB a month. Apart I have this Claro modem, which you can connect to your laptop, it comes for free with my Claro trio at home, and is only 500 MB a month, but as said, it is free. I think you can connect that device to some TP-link convertor, which creates a hotspot ( so you won't need a laptop USB to use the Internet )
The biggest drawback I have seen with these hotspots is that for example my Ipad or phone will update its apps automatically when connected to Wifi, and because for the Ipad the hotspot is just Wifi, it will consume very fast your GB.