Indeed. My grandfathered TMobile plan tends to give me airtime rates of under $0.20/minute while in western Europe as long as I'm receiving and not originating a call. This means I can SMS home to say "call me back". TMobile's current plan is $1/minute and Cingular is $1.20. My grandfathered plan is cheap enough that it's a significant reason to stick with TMobile. I haven't priced out pre-paid cards lately, but I think my air rates are comparable.