The phones of both provides are sold unlocked per default and all providers here use compatible frequency ranges for GSM and UMTS. That means that you don't have any problems using a phone from one provider with another provider. Plans of those providers also do not have any "minimum duration" - so you can quit at any time (although there's not really a reason for this, as most of the plans do not have monthly fixed costs, but only the variable costs).
Of course there are also other, more expensive providers with things like minimum contract durations and so on. But unless you want to buy a subsidized iPhone there's not really a reason to use them.
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That's seriously unbelievable. Honestly, can you hook me up with a link that has some deets? I'm just in shock. What a racket.
Here's the Austrian provider that I use: http://www.bob.at/ (but there are also other cheap providers here such as http://yesss.at/). Both providers act as MVNO (http://en.wikipedia.org/wiki/Mobile_virtual_network_operator) using the net of a larger provider - therefore you typically have a very good wireless coverage.
The phones of both provides are sold unlocked per default and all providers here use compatible frequency ranges for GSM and UMTS. That means that you don't have any problems using a phone from one provider with another provider. Plans of those providers also do not have any "minimum duration" - so you can quit at any time (although there's not really a reason for this, as most of the plans do not have monthly fixed costs, but only the variable costs).
Of course there are also other, more expensive providers with things like minimum contract durations and so on. But unless you want to buy a subsidized iPhone there's not really a reason to use them.