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Both are usually referred to as same things.

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Posted by akumar_8181

A prepaid SIM card is the one, which is used in a GSM mobile phone.

www.planetomni.com/ARTICLES-Mobile-SIM-Card.shtml

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Posted by drolet_55

A prepaid SIM card is purchased for a set amount that acts as a credit balance with the provider.

For details visit:

http://www.wisegeek.com/what-is-a-prepaid-sim-card.htm

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Posted by sagitraz