T-Mobile Hot Spot

T - mobile recently bring out a genius idea on saving money on Home Phone. Most people are paying over $30 for their home phone serviced by those monopoly phone company. With all the junk fees, add up to over $30 per month.
Instead of paying $30 a month for the home phone you rarely used in a month, since you also carry a cellphone, why not pay something much cheaper? Majority of American family carries fast internet access; T - mobile provide you a device which can convert your cell phone to home phone with clear voice (some cell phone doesn't have clear connection when it was inside a building). For a monthly fee of about $10. You can keep the same number as your home phone and cell phone number too. What do you think of it?