Will new simcard make my phone faster?

I have an iphone and I have like a really old simcard. It is white, with an orange stripe across it. It's pretty old and faded, but it does have the 3G lettering on the BACK of it, not the front like the new blue ones. I was wondering if I buy a new simcard, the blue ones, if it would make internet faster on my iPhone...

It is AT&T, and my sim card still says Cingular
 
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