I supposed you can do that, as long as you use the same phone number to request a activation code, then use that particular code to activate the Viber app in your new device.

I suggest uninstall Viber on the iPod 1st(to prevent opened on two device at same time) then install to ur iPad 2, activate use the same no. and don't forget sync the latest Phone book contact. U still can use Viber on ur iPod but need another no. for the activation, install again and activate with the another no.

Viber has explain to me because this not using ID/e-mail but using international telephone number.
When every 1st time installation need to get the activation code in order to 'create' an account in the viber server and verify the international telephone number are real and belong to u. So, (I guess) the app itself and the server are holding and using same activation code. If activate in another device using same no. , the another activation code generate, therefore the old code will be 'substitute' by new code in the server and result can't use in the 1st device.
Hope this help

Yes, they have many questions because Viber on Android is still young (officially released only a few weeks ago). But we're listening to their suggestions and trying to improve as we go along.

@sugen - we are still not exactly sure just how we will implement Viber online on 2 simultaneous devices. It's still in discussion.

Hi all,

We're running a quick survey among our users (in Viber-dedicated threads only).

We'd like to hear your opinion: What is Viber missing the most? If you could choose the most important feature that you'd like to see in our next big version - Viber 2.1 - that's coming up soon, what would it be?

Let your voice be heard