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Maintaining a fortnightly release schedule, Apple has seeded beta 4 of its iPhone OS 4 to developers. Complete changelog is missing but devs are reporting about a new option to change wallpapers. Other than that, a new configuration setting has been found for AT&T users, allowing them to tether their internet connection with other devices.

Although Internet Tethering is supported by many international carriers since iPhone OS 3.0, AT&T iPhone users will be able to do it after the new update hits summer this year.

[Via Macrumors]