Luckily there is some breathing room if you do choose to use the Mobile Hotspot and tethering features. T-Mobile representatives stated that there will be a grace period of sorts when this change comes into effect. You won’t be blocked from Wi-Fi sharing, but if you are found to be using your phone as a modem then you may be blocked at any time. No one will state how long you are able to continue using your phone as a modem until they block you, assuming you don’t plan to sign up, but one could assume at least a week of service seems fair enough.
If you currently use the HTC Sensation 4G, you will have to pay the fee for the hotspot feature. Although, you will be getting a free upgrade to Ice Cream Sandwich so the tradeoffs are almost worth it. Some people may be disappointed that they will have to add $15 onto their phone bill each month, and that makes sense, but Ice Cream Sandwich should be more than enough to impress.
If you want to create mobile hotspots, then why not get a device that does the job better than your phone? If you plan on making enough use of your hot spot package on your phone, you might as well get a MiFi plan using a dedicated device that will get you faster speeds and better results for nearly the same price. It’s well worth the money for a dedicated hotspot device when you use it frequently on the go.