Re: cell phones for multiple countries
Buy an unlocked GSM phone. Whatever country you are in at the time, go to the big cell phone company's store and purchase a SIM card for using prepaid minutes with. In most countries, receiving calls will be free and you will be charged a reasonable rate per minute to call (with text messages generally being free to receive and much cheaper than calls to send).
This is what I do and it is by far the best solution. If you are like me and save your SIM cards after you leave, be sure to remember when they will expire (usually you have to add credit once every 6 months or it is no longer any good).
Edit: This advice is for making local calls. For international calls, use Skype with your computer or a similar service.
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