Agree with UAL Traveler; purchase a GSM900 phone in HKG and then just purchase pre-paid SIM's during your travels. I purchased a NOK61xx in HKG a couple of years ago for 50 USD; a 3310 might be one to look for now although you may wish to purchase a similar model to your U.S. phone so you can share accessories. FWIW, in Singapore M1 does offer a roaming SIM card but they've had problems with it. Many local pre-paid SIM's offer excellent rates for calling back to the U.S. For example, the M1 card costs 18 U.S. cents per minute to call back to the U.S. and in Australia an Optus SIM cost ~ 16 U.S. cents per minute.