In the US, what's a good prepaid GSM SIM card without a phone? [closed]

My daughter is going to spend the next school year (August 2011 to June 2012) in Memphis, TN as an exchange student from Switzerland. She'd very much like to use her iPhone during her stay in the United States.

What are her options for getting prepaid talk, text and data services without also having to buy a new phone? I realize that she'll be limited to AT&T and T-Mobile because of the GSM network.

As far as I've read, T-Mobile SIM cards only work on T-Mobile branded phones, so is AT&T her only option there?

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Which prepaid SIM card is best in USA?

The Best Prepaid SIM Card for USA Travel

T-Mobile Prepaid SIM with Unlimited Data.
Three Prepaid SIM with 12GB Data.
AT&T Prepaid SIM Card with 22GB Data.
Orange Holiday World SIM Card with 10GB Data.
LycaMobile Prepaid SIM Card with 4GB Data.

How do I get a temporary SIM card in the US?

You can purchase an AT&T SIM card along with a prepaid plan online, or you can head to an AT&T store. Other retailers such as Target, Best Buy, and Walmart sell AT&T SIM cards for around $10, which is more than you would pay online but always an option.

Which SIM card is most used in USA?

Top 6 Best SIM Cards Compared

#1 AT&T Prepaid SIM.
#2 Verizon 3-in-1 Postpaid/Prepaid SIM.
#3 SpeedTalk Mobile Preloaded SIM.
#4 Cricket Wireless Prepaid SIM Card Kit.
#5 SpeedTalk Mobile SmartWatch SIM.
#6 T-Mobile Prepaid SIM Starter Kit.

Can I use a SIM card without a plan?

After verification, the SIM can be removed as the apps do not require a SIM card or a service plan to functions seamlessly. A SIM card holds the International Mobile Subscriber Identity or IMSI. It identifies the user in the operator's network and authenticates the user with the cellular service provider.

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