For my last several visits to Argentina, I've bought a SIM card and charged it as needed for data only for my cell.
I have a Movistar SIM from my trip in February.
1) Do these expire? Can I charge it when I go again in November or do I need a new one?
2) I am also traveling to Brazil and Uruguay. I assume this kind of prepaid plan will not roam. Is that the case? If it does roam, are the charges very high?
I am basically between getting a global sim ($60 for 1GB of data) or trying to use the Movistar SIM I have.