It's _really_ hard to come up with a coherent theory of European telecom pricing; it is just all over the place. For instance, Ireland is more expensive than the UK thing... So it's a density thing, right? Not so fast; Germany (denser than Ireland) is also more expensive than Ireland... There are some general _trends_, but big exceptions to all of them.
> The prevalent means of connecting to the Internet in Germany is DSL, introduced by Deutsche Telekom in 1999. Other technologies such as Cable, FTTH and FTTB (fiber), Satellite, UMTS/HSDPA (mobile) and LTE are available as alternatives.
I have unlimited with my plan. I just compared the costs of all plans with the added costs of a new smart phone. The very best return was actually going with the almost highest plan.
So I always recommend to do the Excel sheet and include all costs for the 2 year contract.
Well, T-Mobile is just way too expensive anyway. I pay 25€ for unlimited with Vodafone. It's not the best network but it works surprisingly well where I live. I get ~500mbps at work and ~300mbps at home. Much better upgrade than the one from 3G to 4G.