I am traveling abroad to Italy and was told to buy a SIM card to avoid roaming charges. I tossed my manual over 2 years ago when I got this phone, a Motorola KRZR K1m. It has a microSD chip slot, but I do not see a sim card anywhere, not underneath the battery or anywhere else. Do some phones just not come with SIM cards, depending on provider? Should I really worry about a SIM card while abroad?