Can't you just sign up for one of their "individual" business plans? It has data packages for the Truphone 8 countries.

http://www.truphone.com/us/business/Price-Plans/

Their cheapest plan is $50 for 300 MB, 300 min, 300 sms. I'd barely use the minutes or SMS, so I'd be paying $50 for 300MB, which is 16.7 cents per MB. I'd be better off pay for pay-as-you-go data at 9 cents a MB ($27 for 300 MB).

Here are the tariffs in Euro: https://www.truphone.com/row/lp/hello-world-eu/

Finally a positive news for us PAYG customers!
P.S.: Did you notice that in the US incoming calls are free even on the US number?

For anyone with a Truphone SIM in the US: can you confirm whether you can use AT&T's 3G network now? Last I knew you could only use AT&T's 2G data, so I emailed asking if this would change with the upcoming pricing change, and the reply stated that you can connect to AT&T 3G now.

Whoa. Thank you. I hadn't caught that, and that's definitely a big deal. No US providers do free incoming calls on prepaid, and I never thought that would change.

As of today, in southern California; no, it only works on 2G.

yep, Edge here in Boston, that's 2G

Test rates after July 1st
 

I assure all of you I will test the new rates in California soon after July 1st.

Lots of posts in the last few days from U.S. users.
I am confused. Why would a U.S. user bother with Truphone (or any other intl card) since they can use a T-Mobile U.S. account and roam with unlimited data and text and 20¢/min voice (free voice back to U.S. when on wifi w. most Android phones)?

That does require activation of a monthly plan at $50 per month. Though you can cancel at anytime. But if I am going to go somewhere for one week, I don't think it is worth it.