Never buy Mexico plns with Clay Sim Cards --- I am currently in Mexico and so frustrated with Clay Internationals Sim Cards. Their services here are simply pathetic. There is perpetually no signal no matter what i do or where i go. I have written several emails and called the customer number, but nobody seems to be quite interested in helping me out. Their services are as CHEAP and POOR as they can get. A totally frustrated experience using them. Wont ever use them again.