The $14.99 monthly unlimited tethering / mobile WiFi hotspot add-on for your phone that T-Mobile promised in time for the holidays will be getting real this weekend, hitting on Sunday, November 14th. Of course, owners of myTouch 4Gs, G2s with the latest firmware update, and a couple other models in the T-Mobile stable have already been enjoying the option, gratis, for a couple weeks -- so it'll be interesting to see how many subscribers they convert for the $15 upcharge. Certainly makes those
