Gophone SIM activation/deactivation
I was in the United States last week and bought a $10 gophone SIM to use while there. The 'package' expires on July 4. I know I could keep it all in good standing by purchasing more time but I don't want to do that since I have no plans on being back in the US until September. Is there a time limit on my SIM (say two months) after which I will be unable to reload it and continue to use it?