Do I need to buy a standard 3GS SIM card for iPhone 3GS or just a standard sim?

Do I need to buy a standard 3GS SIM card for iPhone 3GS or just a standard sim?

I'm unsure what you are referring to as a 3GS SIM card? The iPhone 3GS takes a regular SIM Card. The iPhone 4 and 4S take a Micro SIM and the iPhone 5 takes a Nano SIM.

The iPhone 3GS will take any regular SIM card providing your iPhone is unlocked.

Hope that helps.

An iPhone 3GS does take a regular sized SIM card, you don't need a micro/mini/nano SIM for it.

You can pick up a standard 3G SIM card from any network.