I'm pretty close to buying a Tattoo. I need a new phone and this looks like an affordable way to get Android. One of my uses will be as an audio player in the car via the aux-in on my radio. I've used an old PDA for this in the past. I'm just wondering if this will stop me from being to answer calls. Can the internal microphone still work if a normal stereo lead is plugged in? If not, can I use a Bluetooth headset? Or do I need some special cable? I may also use it as a sat-nav. It looks like my car (Hynundai i10) may have a coating like that of my Zafira that reduced GPS signal. With my old PDA's GPS I could plug in an external GPS aerial to compensate for that. It doesn't look like the Tattoo offers that option. Is the GPS sensitive enough to work anyway? I also want to protect my phone. Any recommendations on cases/covers and screen protectors? Thanks