I have the 16GB white iPhone 4 with an OtterBox Defender series case. I kept having problems with my phone shortly after I got it. If I was taking with it on my right shoulder, speaker phone would randomly come on. If I was talking with it on my left shoulder, it would randomly mute my microphone. Putting my finger over the proximity sensor, the screen didn’t turn off. I took the phone out of the case and repeated, and the screen turned off.

I cut the plastic screen out where it covers the proximity sensor, and it works perfectly now.

- Update iPhone 3G to 4.2.1 using iTunes
- Download RedSn0w 0.9.6rc16: http://www.iphonedownloadblog.com/iphone-downloads/
- Download 3G 4.2.1 (8C148) firmware: http://www.felixbruns.de/iPod/firmware/
- Run RedSn0w and follow directions

There are plenty of guides on how to use SSH and WiFi to change file permissions on the iPhone. Unfortunately, I do not have access to a WiFi network. First thought is, I can change permissions with a USB cable. Programs like iPhoneBrowser and i-FunBox do not support file permissions. I tried iPhone Tunnel Suite and WinSCP / PuTTY, no luck. Next idea, how about changing the permissions directly on the iPhone? Terminal, doesn’t work. I found iFile in Cydia which actually works on iPhone 3.0 software. I was able to use this program to make some much needed file permission changes.

In my case, I needed to set a file to “755″. The first number, 7, is for “User” or the owner of the file. The second number, 5, is for the “Group” that the owner belongs to. The last number is for the “World” or everyone else. See the table below for the explanation of the numbers.

---

--x

-w-

-wx

r--

r-x

rw-

rwx