T Mobile v ATT

An inductive argument I used last week was about what cell phone and what cell phone carrier I should buy. I decided on a Windows Phone because the reviews are really good and it’s supposed to be really easy to use. I was torn between buying an unlocked HTC Radar for $300 and buying the T Mobile monthly prepaid plan. The other option was buying the Nokia Lumia 900 on contract with ATT for $100 and being stuck on a two year contract. I reasoned that I should get the HTC because over two years I will save about $400 vs ATT, plus I will not be on contract so I can cancel and change my plan anytime. The T Mobile plan also gives me unlimited data while ATT does not, so I feel like I am getting more for less with T Mobile. This is an inductive argument because even though the premises are true it does not necessarily follow that T Mobile will be the better value. T Mobile might have spotty coverage and I might need to switch to another carrier before two years, likely making the cost greater over a two year period.