I just traveled for the first time using the UM ICQ SIM. I used the SIM for data only as I didn't want to use the Lichtenstein number for incoming calls.
I found that contrary to what is stated in the website, the data works in France and the US.
The buy-in on the SIM is low, for EUR 20 you get a SIM with a full 20 EUR of credit and free shipping.
www.icqsim.com