With Mobile Data and background app refresh turned off, can WhatsApp receive a call while the Wi-Fi is enabled, and the iPhone is connected to a Wi-Fi access point with active Internet connection?
If the iPhone is resting on a table, will I receive a normal WhatsApp call or not? Or will it remain closed, unless I pick the mobile in hand and turn-on the screen.
I will be using my iPhone in another country with international roaming active.