The iOS 4.1 Beta 2 for all iPhones and iPod touches now available via Apple Developer channel. This means this beta release only available to iPhone Developer Standard or Enterprise Program member. According to various report this beta release fixes the proximity sensor issue, as well as, slowness issue of iOS 4 / 4.0.1 on iPhone 3G. Download iOS 4.1 Beta 2 & SDK Related posts:Download link of iPhone OS…