You can answer your phone with the cover closed. A caller id will appear with the phone info so you know who's calling. A 'green' phone will appear on the left to answer the phone. A 'red' phone on the right to hang up. Simply put your finger on the response you wish and slide it in the opposite direction.

Note: I still think the cover is a good buy, but be aware that the fabric on the front cover can start to peel. Think of it similarly to the clear plastic covers for the screen. They always start peeling on the edges.