I've been using WhatsApp on my Android Smartphone.
That phone is now broken, and until I have a new phone capable of running the WhatsApp App, I'm now using my older "non-smart" phone. My SIM card works well with it, but I can only do phone calls and SMS.
I have a couple of desktop/laptop PCs available, running Windows 7, 10, and Ubuntu.
So what exactly are the steps – installation(s) of additional software, use of a WhatsApp service for this kind of matters, … to be able to have my WhatsApp account work with a "PC interface"? I can have my phone turned on at any time, but it is really old. No Android, no WhatsApp App.
Note that before I've been using WhatsApp Web from time to time, which needs the smartphone to be powered on and online, which I currently can't do. I can currently only use plain old mobile services with my mobile number: calls and SMS.
Best Answer
You can use an emulator like BlueStacks or Remix launcher.
Just install WhatsApp and manually input the confirmation code that you get through SMS make sure the phone number you use is the same as your sim cards phone number.
Edit: this should work if you can still send/receive SMS as you only need to input the correct confirmation code that you get from an SMS message
Edit edit: an (almost) complete guide is at WhatsApp: Getting started, it states: "Enter the number the same as you would if you were to make a phone call to that person." You should get an SMS from WhatsApp a few seconds after proceeding with the "confirmation code" Which you will have to fill in the emulator"