How to disable Wi-Fi and 4g at certain times on an iPhone?

Specifically the iPhone 4g

In settings, tap on Wi-Fi, and turn it on or off as required.

In settings tap on mobile, turn 'enable 4G' on or off as required

When both Wi-Fi and 4G are enabled and you're logged into a hotspot, 4G picks up phone calls but the Wi-Fi picks up data.

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