Can the Viber software be installed and run nn an Android-based tablet without a SIM card?
Yes, you can install Viber on a tablet without a SIM card but to activate your account, you need to have a phone with you to enter the number when you'll be asked. Once you receive the code, you can enter it on the tablet to activate the app.
So you cant then. The phone used in the previous answer needs a sim meaning you can't use Viber without a sim. I just tried it with a landline and it doesn't work.
I have successfully installed now whatsapp on my Asus tablet MemoPad HD 7 ( using manually downloaded apk from this page https://www.whatsapp.com/android/ ), which is without simcard, and I have been using my regular cell phone to get the sms verification. But because I couldn't enter nowhere this code on the tablet, I've been typing v.whatsapp.com/mycode on my firefox for tablet, and click enter, and firefox immediatelly transfered that to whatsapp aplication and verification was successfull :D
once you activate viber using another phone, that viber account on that other phone gets deleted automatically