Because of excellent advice on this newsgroup I was able to buy a
prepaid SIM (Vodaphone--D2) in Germany and use it in my Motorola V66
phone.  It turned out that I could even call back to the USA--of course
it was very expensive.

Now that I am back in US, would I be correct that the SIM will no longer
function.    As I understand it, the SIM uses 900/1800 GSM frequencies
in Europe, and of course here in US the GSM frequency is 1900.

At first, after the SIM was installed, the phone wouldn't work.   I had
to consult several people at VOdaphone, and finally the fourth person
realized that the frequency change was needed---but even the Motorola
V66 manual didn't make any real reference to this.  I was simply
surprised that the first 3 people at Vodaphone (and even T-Mobile)
couldn't figure out the problem.   I guess that lack of training of
sales people extends everywhere.

Thanks
Mahl