Prepaid Gsm Sim Card Can I Use My Singapore GSM Mobile Phone In The US With A Local SIM Card?

Can I use my Singapore GSM mobile phone in the US with a local SIM card? - prepaid gsm sim card

After landing in San Francisco, I would insert a prepaid SIM card on my GSM phone. That would avoid me a local number of U.S. cell phone while I'm in the United States, and at exorbitant roaming fees. These cards are available in the United States?