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Also know, should cellular data be on or off on iPhone?

It's absolutely OK to turn off Cellular Data if you have a minuscule data plan or you don't need internet when you're not at home. When Cellular Data is off and you're not connected to Wi-Fi, you can only use your iPhone to make phone calls and send text messages (but not iMessages, which use data).

Similarly, how do I turn on cellular data on my iPhone? How to turn on cellular data on iPhone

1. Launch the Settings app from your Home screen.
2. Tap Cellular.
3. Tap the switch next to Cellular Data to turn it on.

Likewise, what is cellular data options roaming?

Data roaming occurs when your phone has gone off of its primary network and onto a different one to ensure continued voice and data coverage. Most carriers have roaming arrangements domestically, and the process of jumping on and off new networks is seamless.

Why is cellular data not available during call?

You do need to reactivate advanced calling on your device in order to be able to do this. You will need to go to: Settings> Cellular>Enable LTE>Voice and Data. Make sure there is a check next to this category. Restart the device and test it out.