If the unlocked model is seductively discounted, as I saved about 50 euro in purchasing my Xperia Z2, I prefer this solution. I have to add that I have a postpaid subscription for 5 years, that I use for my daily needs, with locked or unlocked phone
If the smartphone I want to buy is more affordable on a carrier, including the subscription, I don`t hesitate to sing a contract, since I use to talk a lot and browse on the internet, so I will eventually consume all the benefits included