justinomg has put together this amazing post at MacRumors documenting all the undocumented changes in Apple’s latest iPhone 2.1 firmware. Obviously quite a bit of time went into creating this list of new features, so thank justinomg and all the other contributers noted in the article.
justinomg’s post:
Undocumented features/fixes:
All screenshots have been taken and uploaded by myself unless stated otherwise. Please do not use them without crediting me.
Feel free to post any more new undocumented features and I will happily upload a screenshot to the thread, crediting you for the find of course.
• Although it isn’t exactly a “new feature”, some bluetooth headsets which didn’t originally work with visual voicemail and other features on previous firmware versions have been reported to be working on 2.1 by different users.
Confirmed headsets:
• Plantronics 520BT Headset (Credit to trunksu).
• Plantronics 925BT Headset (Credit to diesel).
• Plantronics Voyager 510BT Headset (Credit to QuarterSwede).
• Bluespoon AX2BT Headset (Credit to galenmd).
• Any Chrysler, Dodge, or Jeep vehicle with U-Connect (Credit to mklos).
• You can now pause apps by clicking the icon while it downloads/installs.

• Tripple clicking the microphone button (attached to included headphones) now goes to the previous song played/in a playlist. (Credit to Sealit). (more…)