The reason is you have the original operating system, which came out before the "update software" option existed. upgrade your iphone in the traditional way -- by connecting to itunes, clicking on your iphone's icon on the left, and clicking "check for upgrade".. When you see the option to restore or update, choose update. itunes will try to reinstall ios without erasing your data. wait while itunes downloads the software for your device. if the download takes more than 15 minutes and your device exits the connect to itunes screen, let the download finish, then repeat step 3.. Solved: i have iphone 4.3.5 and there's no software update option under settings. whenever itunes tries to update when i sync it won't go through..
These two options are highly recommended and effective. you can try alternative methods such as restarting your iphone/ipad or forcing shutdown to itunes and starting it again. if the problem with the updates persists, you can check in your settings.. To update the ipad to ios 5, you need to use itunes. connect the device to itunes and it should prompt that a new version of ios is available and allow the device to be updated. then, in the future, the device can be updated using software update from settings.. If an update is available, you'll see an option to update your carrier settings. to see the version of carrier settings on your device, tap settings > general > about and look next to carrier. if you insert a new sim card into your iphone or ipad, you need to download the carrier settings for your new carrier..
