[yardie]

Newer phones are almost all battery with just a sliver for a motherboard. The iPhone4 in particular uses a microsim because they, physically, do not have the space for a larger sim.[1] I'm also getting great use out of it, the battery lasts 2.5 days with moderate usage. Which is something I haven't been able to do with a Verizon Droid Incredible.

http://guide-images.ifixit.net/igi/IP1qEpYFQSSqwSbg.medium