You need an unlocked phone to insert a different
SIM card. If you buy a pre-charged phone
SIM in another country, you can pop it in your own, unlocked phone and start making calls that will debit to the foreign
SIM. Using Cingular's International plan is a killer! I spent $500 calling from France last year.
I love the LG CU500! I returned the Samsung d807 slider phone - too many hokey features, bad design and quality - for this one. Gerat sound, great screen, lousy manual.