I bought an unlocked iPhone 3G on craigslist. Cosmetically the phone looks great, however I had a few questions. 1. How do I enable multytasking? There is a picture background enabled, however I don't seem to get multitasking to work. 2. Battery seems to be running out quicker then it needs to be. I have been playing around with this phone for the past hours, web mostly, and lost about 20% battery. Is this normal? 3. There seems to be lag on this phone. App store seems slow, so is itunes store and safari browser. Also I'm typing on this iPhone right now and there is ba lag on the keyboard. How do I fix these problems. And please be speciox if you can. I haven't use an iPhone in over a year.