Can you put your phone on airplane mode and still use Wi-Fi?
You can use airplane mode to avoid roaming charges when travelling. You won't be able to send or receive text messages or phone calls, or use data services, but you could connect to a Wi-Fi network to check your email or browse the internet.
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Airplane Mode turns off your device's ability to connect to cellular networks (meaning it can no longer send or receive calls or texts, or use data). As it is no longer accessing local cellular networks, it will not be charged roaming fees (caused by your device connecting to networks outside its home region).
In situations where a power source isn't available, turn airplane mode on to stretch your device's precious battery life. Just remember that airplane mode disables your access to cellular data, so don't expect to be able to send text messages or make cell phone calls in this battery-saving mode.
By turning off its cellular, Wi-Fi, and Bluetooth connections in airplane mode, your phone dramatically lowers the amount of electromagnetic radiation it emits. It is beneficial if there is poor cellular coverage because your phone will increase its output to stay connected, increasing your radiation exposure.
Does WhatsApp work even when there is no WiFi? Yes, It does. WhatsApp also works with cellular data connection. It still works if you have no cellular connection either.