Incoming calls while abroad
I am going to India, but will need my mobile number to receive calls from the USA. I have a couple of questions - Will the person calling from the USA be able to call me normally, and will he/she be charged extra for the call? If I receive the call, what would I be charged? If I keep my phone on airplane mode and connect to wifi, will wifi calling work (wifi calling is free as far as I understand)? I am on the ONE plan (family plan) without any add-ons as of now.