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At last Apple has announced to developers that iOS SDK and iOS 4.1 beta are now available from the iPhone Dev Center.

Apps built with iOS SDK 4.1 beta should only be tested on devices running iOS 4.1. Make sure to read the Xcode 3.2.4 Readme and the iOS SDK 4.1 beta Release Notes before installing and downloading these new releases.

Aside from the signal bar changes, Apple has also made a number of other small improvements to iOS in their latest beta which was released to developers.

The SDK build number is 10M2304 and the firmware build number is 8B5080c.

Hopefully some of the false reception readings and proximity sensor issues will be resolved in this update.

Game Center returns to the beta releases with a brand new look. Game Center is Apple’s matchmaking and leaderboard social network for iOS games. The lack of Game Center in the official iOS 4.0 release caused some confusion, but Apple had never intended Gamecenter to be launched alongside 4.0. Instead, Apple had promised Game Center to come out later this year.

It remains in beta testing for now with no announced release date. The style of the app, however, has been dramatically changed from the original release.

What’s New:

● Signal Bars seem to be fixed and are taller
● New Baseband (02.07.01)
● Game Center is back with new look (see screenshot)
● Camera Switch and Flash buttons reposition in landscape mode (see screenshot)
● You can now choose to add Favorite as voice or FaceTime.
● Spell Check can be turned off in Settings

Thanks to iclarified , macrumors