Vodafone sim card from germany?

Last summer I bought a vodafone blackberry sim card from germany and I want to use it this summer for iPhone in paris belgium and netherland.
So my question is, Can I use it? If not does T-mobile can?

Depending on the terms of contract you might be able to use it outside Germany.
But almost certainly the costs will be 'international' and that is not cheap.
It is likely that using your home contract is cheaper and your provider might have a special offer for use in Europe, as many of them do these days.

And a contract (sim card and all that comes with it, prepaid or post paid) for a blackberry will not be specially suited to an iPhone as they have different extras. The basic functions will be available, things that are brand specific might not.

If you iphone is network free phone means, you will be able to use your vodafone sim card. If it's network locked, you will need to unlock it. For unlocking you can approach your service provider or else try to buy an unlocking service from any one of the online unlocking service provider like http://www.simpleunlocking.com/apple-iphone/rs16wp9/