"World Phones": help...how do they work? SIM cards??

[Feebes]

I've never used a phone that works on the GSM900 or GSM1800 bands....nor have I used a sim card before. I am traveling to Italy and I will be using one of these phones as my only phone. What is the difference between a "locked" phone and an "unlocked" phone. Any suggestions on where I should purchase my SIM card to get the best prices? Do SIM cards allow free 800 number calling? Thanks for the help and any tips you can give

 

[isekii]

locked and unlocked refers to certain providers..

if it's a world phone.. you should be able to purchase a sim card from the country you will be at and use the phone ~