Which is the least expensive phone facility?I prefer calling somebody via the landline to a person who I know has a landline, too, as the call is clear, I can talk comfortably for a good amount of time, there is no fear of a drop and it won't create too much of a dent in my phone bill. When using my mobile phone to call, though, I am invariably in a conundrum and would like to know from you which would be the least expensive way to call somebody from my mobile phone.
These are the forms of communication-
1. My landline to their mobile phone.
2. My mobile phone to their landline.
3. My mobile phone to their mobile phone.
4. My WhatsApp call service to their WhatsApp.
5. My WhatsApp video chat service to their WhatsApp video chat.
So, can you list the above in order of the least expensive to the most expensive?