Regarding this, can I update my iPhone using cellular data?
You can update ios 13 using cellphone data
As you need internet connectivity to update your iOS 12/13, you can use your cellular data in place of WiFi. Moreover, just double check your phone's battery as it should not be less than 50% if you want to install the update.
Similarly, can I download iOS update without WIFI? You need an Internet connection to update iOS. You can use your device normally while downloading the iOS update, and iOS will notify you when you can install it. To improve the speed of the download, avoid downloading other content or use a Wi-Fi network if you can.
Thereof, how install iOS update with cellular data?
There is not a way to update your iOS device using mobile data. You'll have to use your wifi. If you don't have wifi at your place, maybe use a friend's, or go to a wifi hotspot, like a library. You can also update it through iTunes on your Mac or PC if you have an internet connection there.
Can I download software update using mobile data?
You can now download the system update using mobile data.