yes of course you can use WhatsApp on pc or laptop for more detail you can watch this video to learn more about
You can use "bluestack" software to run whatsapp on PC.
You have to need net data pack to use whatsapp and only use in Andoide Mobile, smart phone. Also you can send anything without any charge. There are free whatsapp, find it here whatsapp.cm About worldwide free download of Whatsapp and free Whatsapp info
I think it is time to buy a new PC with higher RAM.
Yes, I have a lot of friends that use blackberry and they've got Whatsapp
To use WhatsApp, download the app, verify your phone number, set up your profile, add contacts, and start sending messages, making calls, and sharing media. Keep the app updated for the latest features and follow WhatsApp's guidelines. Enjoy connecting with others through WhatsApp!
Free
Yes, You Can Here Are Some Programs That You Can Use: Skype Yahoo By Komail
WhatsApp is a totally free messenger applications and you can surely use it for free. Just download it from official Google Play Store and get used to it.
then use money
Whatsapp is free, some years ago you had to pay like a 1$. Now its free. Whatsapp es gratis, unos años atras tenías que pagar cerca de 1$, ahora es gratis.
I guess you are referring to free call from PC to phone. VoIP service is the best option. You can use skype.