iOS 5 system software updates for iPhone and iPhone can not only over Wi-Fi wireless downloads, but also via 3G. It would not hold for all over-the-air updates, but for minor updates.Reported that the website 9to5Mac , which have not been able to figure out where the distinction between major and minor update will sit. At the start of a system update you get a warning screen that the iPhone is [much percentage] battery and at least 500 MB of free disk space should have.
The required 500 MB of disk space is not the size that an update will take, but it is temporarily needed for its installation, the website reported. Presumably, the file must be downloaded before the update, considerably smaller than 500 MB. Apple mentioned at WWDC 2011 conference that all system updates delta updates. This means that small additions to the system and no new firmware and large. Apple maintains a while a limit of 20 MB to download applications on a 3G network. It is unclear whether, by definition, system updates will be smaller than 20 MB.
According 9to5Mac However, not all system updates over 3G to download. According to a piece of code with the warning "This update requires a Wi-Fi connection to download. It is preliminary guess whether this applies for example to update iOS 5.1 to iOS 5.2, or iOS 5 to iOS 6. Updates that probably always on the 3G network can be carried out behind-the-point updates, such as iOS 5.1.1 to iOS 5.1.2.
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