Since VM has this phone on sale for $19.99, I was considering getting one (or two) for media/MP3 players (ONLY). However, the battery life has me a bit concerned. Obviously, I would have GPS, data, and (usually) WiFi turned off. Would this phone be suitable in this scenario? I'm curious as to whether running a custom ROM (i.e. Harmonia 2) improves the battery life at all (I currently run that on my Optimus V and get great battery life). Thanks in advance!