Is T-Mobile Good for Travelling Overseas?

Albert travelled overseas and brought his T-Mobile phone because it offers free 2G/EDGE speeds. Leo says that it works great, even if it's slower. He can pay $10 a day for a limited amount of data on other wireless plans, too. And that's largely thanks to T-Mobile disrupting the industry.  Leo also says to google Prepaidwithdata Wiki and go to the page to find out where he can get a MiFi card when travelling overseas.