reply to Unit649
Re: Expert?!? HA! Remember some international providers from 3rd world nations like to send bills of random cellphones to American carriers. Verizon Wireless for example doesn't let you roam internationally unless you unlock your account first with a call to CS. Otherwise a nigerian cellphone provider will stuff a bill with fake calls to Zimbabwe from your randomly chosen phone number.
You must add the International Dialing feature (I-Dial) to your account before you leave the U.S. in order to be able to roam using your existing phone in any international destination other than Bermuda, British Virgin Islands, Canada, Guam, Jamaica, Saipan, and the United States Virgin Islands. I-Dial eligibility restrictions apply.