I suspect from reading the notes here that the Canadian Bell Mobility quad band Ace Samsung is locked so that a French SIM card would be locked out similar to the case of the Verizon cited, even though GSM technology is not used in Canada and the phone works locally on CDMA without the SIM card in.
Don't wish to buy a French SIM card if it is useless; can anyone help?
Its a little different. If the phone (havent looked it up) takes a sim card then it will work on a GSM network. The only problem is you have to get it unlocked. Never found out how to do that, but maybe someone will be able to answer that for you. I have seen threads in the mobile phone section about unlocking phones.