We have several world GSM phones that we need to activate for use in Greece, then primarily Italy. Does anyone have any suggestions for where we might get the best deal on SIM cards, preferably before we arrive in greece. I am told that if we purchase an Italien SIM card, it must be activated in Italy. Is this so ?

I would get the SIM card for Greece it has the best plan and service for what you need.It will work just fine in Italy and in a number of other countries. You can go online to www.tetestial.com and bring up all the SIM cards and read about the features for each Countries cards