Where can I get a pre-paid data sim card for use in the USA?

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Posted by Kaiser_Man
I have bought a 3 MiFi dongle which came with 3gb of pre-paid data allowance. 3 offer an unlock service for the dongle which means I will be able to use it abroad.

I have a few US trips planned and I want to know if I can buy a sim card similar to what 3 will supply from one of the carriers so I can use the dongle in the US.

Any ideas?

Kai

Posted by Kaiser_Man
No-one?