aint that the truth.   I once got suckered into using a roaming plan from where I happened to live at the time and when I got to the next country it was so unbelievably slow that most of the time I felt as though it wasn't working at all.  Can go ahead and forget about making a phone call over the speeds i was getting.  Here in Vietnam a sim car with a month's validity and more than enough credit to last for that long is $8, in Thailand it was around $10 or $12