iPhone 4G not listed, iPhone OS 4.0 has been released, iPhone 4G systems have to use iPhone OS 4.0
iPhone OS 4.0 features the three main
1. Multitasking
2.Home key applications
3. Multi-account mailSource URL: https://celcells.blogspot.com/2010/04/iphone-4g-system-will-use-iphone-os-40.html
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