With a built in face fronting camera, the iPhone 4G better have a battery powered by kryptonite or else the battery will deplet faster than Tiger Woods can go through a pack of condoms in one night.
Everyday I leave the house with a Nokia E52 and an iPod touch in hand. Some question why I carry two devices when I could have just bought a top of the range iPhone with the money I spend on my two devices. My rationale is simple.
The problem with all-in-one devices is battery life. I always laugh at iPhone owners who walk around with brightness set to 20% while mine is always on max. Secondly these iPhone owners carry their USB cable with them everywhere, ready to charge the device 2-3 times in one day OR even keep it connected to a power source as if it was a laptop.
Last week I downloaded Geo-Defence, a highly addicted game worth buying. But playing it intently for 40-60min, the battery drains fast. And this is only a device I use for music playback and casual gaming once in a while. I cannot imagine myself using it for video chat too, let alone phone calls. The compromises in the name of battery life would be too much.
With two devices I can listen to music and make phone calls without worrying about conserving battery for the other. Sometimes I go for two days without charging either devices. In fact. My Nokia only gets charged once or twice every week. It gives me a peace of mind to be able to use my device in any way I like without conciously worrying about battery life.
So until battery technology has caught up with the ever-more features manufacturer are packing into phone, I'll keep carrying two devices.