Wifi + 3G version can use whatsapp?

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May I know for this tab as it don't support calling function,
but can it still use app such as "whatsapp" and "viber"?
as those apps still need a phone number?
wifi only version and wifi+3g version both can or cannot?

yes you can

Doing that with my 8.9LTE.

You need to grab the apk file from somewhere as the market will not show it (the tab is not a phone).

You also somehow need to import your contacts so that they can show up.

Your sim card has a phone number even if it is not meant for calling.