I'm planning to spend about a week in Austria.
I'd like to have mobile internet (mostly for geocaching). 100MB should be enough, however, it would be good to have a bit more. I'd like also to have the possibility to call foreign numbers with reasonable price (my travel friends).
Crucial factor: prepaid card should be ready to use just after purchase, so if internet registration is required, it would be rather no-go (the need to search for Internet Cafe etc.).
Does something like that exists? If not, what would be the nearest hit?
For example, in Germany there's Lebara, with mobile plan for 10 Euro, and very cheap foreign calls, but it requires internet registration. T-Mobile is registered by purchase and ready to go just seconds after, but it has extremely expensive foreign calls. If the situation is similar in Austria, in worst case I would have to choose one of available options, or buy both.