Best SIM card to buy for a visitor

[breezydusk]

Hi,

My dad will be coming to the US for just 15 days and will be traveling quite a bit around the country that time. He has his Indian GSM cell phone with him. So, I thought of buying him a prepaid SIM card in the US, so that he can use the same on his phone.

Any suggestions for such a SIM card??

Thanks,
BD

[sk4ih]

You can go for AT&T or T-Mobile prepaid card.
Calls within same network are free.
So decide on which one to take based on what majority of his friends/relatives have.