Ammar Ibrahim's blog

I have an iPod accessory/connector in my car to recharge and play music to the car's stereo system. Whenever I connect my iPhone the phone goes crazy and keeps giving a pop up, even if I unplug it, the message pops up every minute, and it really is annoying. After searching, and testing alot of methods, I found this to be the best method. Credit goes to (Suondmao), I edited the description to make the steps easier.

1. Download this file (iapd patched for version 2.1). 
2. Extract it
3. SSH to your iPhone
4. cd /System/Library/PrivateFrameworks/IAP.framework/Support
5. then back up the current iapd using this command: mv iapd iapd.bak
6. copy the patched file you download to this path
7. Set the file permissions of the new iapd to 755
8. Reboot iPhone

Update: Thanks to Tim (comment below), this also works with 2.2)