Getting 3G toggle back in iOS 8 - Solved
All those missing the 3G toggle after updating to iOS 8 - here are some solution to try:
Mostly, everybody updated over the air(OTA) using Wi-Fi, something broke there & quite possibly also missed the included Carrier update.
As iOS 8 is a major jump, try Restoring through iTunes, it works.
You could also download the Firmware(.ipsw) file for your model & use click Shift/Option on Restore in iTunes.
Remember to backup your device in iTunes first.
Another Option is to go to an Authorized Apple Service Center & they will do it for you - tested & works.
You get your 3G toggle back in iOS 8 if your Carrier supports it.
Note : Applicable for users who had 3G toggle under Cellular in iOS 7.1.2 & lost it after updating to iOS 8
iPhone 5c, iOS 7.1.2, Windows 7