Thanks!

I am forwarding another Q coming from my colleague:

I will visit Europe in the following manner: 9 days in Austria, 1 in Switzerland and 4 in Germany.
If only 3G Data SIM is required, high download speed, may be limited to 10GB, Which SIM will have the best quality, cost effectiveness and rooming ability (or three different types)??
Is it recommended to follow wikia recommendation [i.e. 3(Drei) Austria or another]?? didn't see rooming solution...
Austria - Pay as you go sim with data Wiki
Germany - Pay as you go sim with data Wiki

Thanks,
Meny

Have you actually read my posting on this thread? Data roaming is prohibitively expensive within Europe and given your colleague's requirements absolutely infeasible. The linked Wiki lacks the probably best choice for your requirements, Lidl. With a Lidl SIM that costs € 9.95 and includes € 10 of credit you could subscribe to the dayflat tariff which would give you 500MB per 24h for € 1.99/24h. In contrast to other German prepaid providers you really get 24h while others bill by calendar day, so whenever you start a data session it ends at midnight.