Answer to: I can charge iPhone with wall charger but computer wont recognizeI had this issue with my iPhone 4. It would charge via AC Outlet or Car, but not be recognized nor charge when connected to a computer. I took it to the Apple store, they said it was due to corrosion on a few bottom data connector pins. After promising "I would never drop it again" they replaced it, but I have heard some have success cleaning the pins with rubbing alcohol and a QTip.
Answer to: Trouble connecting to GPS signalI had this same problem, at times it would take 15 minutes to "Acquire" a signal, this, of course would happen while I was trying to escape South Central Los Angeles. Updating the software didn't help, the only thing that assisted is where I placed the GPS on my windshield. The further down (which I assume gave it a clearer line of sight) helped. I nearly contemplated getting a bean bag looking thing and placing the GPS on top of it, so that was it was in the middle of my dash. Prior to being able to do this, it got stolen (see earlier South Central LA paradox), and I bought a Garmin which has been working fantastically.