Here is the readme I found within the "iPhoneDocumentation_3.0.ipd" for iPhone2,1 (iPhone 3G S)
iPhone OS 3.0 Software UpdateThis update contains over 100 new features, including the following:
• Cut, Copy & Paste with shake to undo
• Landscape keyboard in key applications
• Enhanced Messages application
- Send and receive photos, contacts, audio files, and location via MMS*
- Forward and delete single or multiple messages
• Added search feature in Mail, Calendar, Notes and iPod
• Spotlight search across iPhone
• Support for CalDAV and subscriptions in Calendar
• Improvements to Safari
- Performance
- HTML 5 support
- HTTP Streaming audio and video
- Auto-fill usernames and passwords
• New Voice Memos application
• Sync Notes with a Mac or PC via iTunes
• Internet Tethering over USB and Bluetooth*
• Browse and download movies, TV shows, and audiobooks from the iTunes Store**
• Stereo Bluetooth***
• Wi-Fi auto login
• Enhanced Stocks application
• More Parental Control options for Apps, Music, Movies and TV Shows
• iTunes account creation and login**
• YouTube account login and access to subscriptions, ratings and favorites**
• Shake to shuffle
• New languages, dictionaries, and keyboards
• Find my iPhone and Remote Wipe via MobileMe (subscription required)**
• Support for more Exchange policies
• Create and send Exchange meeting invitations
• Search mail on server (Exchange Server 2007 and supported IMAP servers)
• Search LDAP company directory
• VPN on demand and VPN proxy support
• Encrypted configuration profiles
• Encrypted iTunes backups
• 1,000 new developer APIs, including:
- In App Purchases
- Apple Push Notification Service
- Accessories support
- Peer to Peer Connectivity
- Embedded Maps
- iPod Library Access
• Bug fixes
Products compatible with this software update:
• iPhone
• iPhone 3G
• iPhone 3G S
* Compatible only with iPhone 3G and iPhone 3G S and requires support from your wireless provider.
** Not available in all regions or in all languages.
*** Compatible only with iPhone 3G and iPhone 3G S.
For feature descriptions and complete instructions, see the user guide for your iPhone at:
http://www.apple.com/support/manuals/iphoneFor more information about iPhone, go to:
http://www.apple.com/iphoneTo troubleshoot your iPhone, or to view additional support information go to:
http://www.apple.com/support/iphoneFor information on the security content of this update, please visit this website:
http://support.apple.com/kb/HT1222 Anyone can confrim with this? But as i know, if the regional language support there got 'Malaysia', sure the caller ID is suit with our 1 already....
Since the 3.0 news come out, i flash back to orignal firmware without JB and wait for this long long time...

yes, it confirmed.. i using iPhone 2G 3.0 GM.. the Called ID is fixed for Malaysia. so no need to JB now
I think Apple will use 3.0 GM as the release since the iPhone2,1 firmware is 7A341 which is same as the GM.