Today Apple Released iOS 4.1 for iPhone 4, 3GS, 3G & iPod Touch 3G & 4G. Check its feature list and download link.
First of all, its yet not safe to upgrade if you want jailbreak or unlock.
iOS 4.1 Feature List:
● Game Center
– Send and receive friend requests
– Invite friends to multi-player games over the Internet
– Play multi-player games by auto-matching with other players
– View LEaderboards and Achievements
– Discover new games from friends
● High dynamic range (HDR) photos on iPhone 4
● Support for TV show rentals on iTunes
● Ability to upload HD videos to YouTube and MobileMe over Wi-Fi on iPhone 4
● Additional support for AVRCP-supported accessories, including next & previous track control
● FaceTime calling directly from Favorites
● Bug fixes, including
– iPhone 4 proximity sensor performance
– iPhone 3G performance
– Nike+ iPod fixes
– Bluetooth improvements
This Update compatible with
● iPhone 4
● iPhone 3GS
● iPhone 3G
● iPod touch 2G
● iPod touch 3G
● iPod touch 4G
Game Center requires iPhone 4, iPhone 3GS, iPod touch 2G or later.
You could always get support from UnlockAlliPhone.com about any Unlock & JailBreak issue of any model of iPhone including iPhone 2G,3G & 3GS and latest iPhone 4. They provide Premium Members Support for life time. Means just pay one time a small fee and you will receive support(real human support – avg response time 2 hour) for all present & future version of iPhone.