In my eyes a GPRS or 3D flat is a nonsense.

I'm working day and night on my n900 and 250MBytes are more than enough. (5$)

A flat for WLAN is useful when you are at home.
The n900 is brilliant in switching to the right network automatically.
It does it in the right moment without any help.

For the moment I have the problem that I have also no flat at home.

But without HAM I can even live without any flat.

In my eyes a GPRS flat is only for snobs.
There isn't any realistic use for it.
(You can download films at home and watch them during your trip.)