After having some keyboard problems with my LG Extravert (a few keys decided to stop typing), I called customer service. They said they'd send me a new phone and to take the SIM card out of my current one and put it in the new one when it arrives. I can't seem to find the SIM card, and the manual isn't of any help.
On the bottom, there's a small indent, which you can use to pry off the backing. Once it's off, you'll see the lithium-polymer 950 mAh battery. To the right of the battery is the microSD card slot, which holds cards up to 32GB.