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The iPhone 4 can currently run up to the latest version: iOS 7.1.
Yes they do but remember to upgrade to the latest iOS version 6
The ios 8 should work on the iPhone 4 now. If you cannot get it to work you should call the company and tell them what is going on. This is incorrect ios 8 will not work on the iphone 4
No. The iPhone 4 runs on iOS 4, the current version being 4.1.
I have a 3G iphone with ios 4 and it didn't work on it
Yes, you can run iOS 7 on the iPhone 4.
The iPhone 4 can only support from iOS 4.0 to iOS 7.1.2. There is no way to get any higher iOS Firmware due to the older hardware that is built into the iPhone 4.
iOS 5 will be compatible with iPhone 3GS as well as iPhone 4.
Currently, as of 4/22/2013, the latest version is the iPhone 5 and latest iOS is iOS 6. The newest technology would be a bigger screen and faster processor, regardless.
Since ios 7 is designed for the iphone 5, it will probably make the iphone 4 slower.
Just got back a month ago from the Philippines. I have an unlocked US version of iPhone 4 running iOS 4.0. Worked like a charm. Hence the word "unlocked" so yeah it will work just fine. Unless you're iPhone 4 is running iOS 4.0.2 and above (which the latest is 4.3.1), then you're out of luck, that is, you cant unlock your iphone through Ultrasn0w. If you plan to go there soon, probably try GEVEY SIM for iPhone 4 as this hardware mod can unlock iPhone 4 on iOS 4.1 to 4.2.1. Retails about $70 but eBay has cheaper ones. But if you are not in a hurry, the Dev Team is trying to crack the iPhone NCK Key that can permanently unlock your iPhone 4 for life. You can wqit for that too. Good luck! iPhone 4 16GB Black iOS 4.0 Jailbroken using jailbreakme.com Unlocked using ultrsn0w 1.2
This was created to add support for the Verizon iPhone. No device uses it except the Verizon iPhone 4, as the same feature was added to iOS 5, and the iPhone 4S included iOS 5. It is essentially iOS 4.2.3 for Verizon.