Here is the solution guys!
the device must be jailbroken
remove whats app and whatspad from ur device
get ifile from cydia
download whats app from appcake or similar application
Go into iFile /var/mobile/Applications/WhatsApp/WhatsApp.app/ Go down to Info.plist (it's alphabetical)
Choose text view & once it opens click on edit, scroll downfind this (near bottom) :
</array>
<key>UIRequiredDeviceCapabilities</key>
<dict>
<key>telephony</key>
<true/>
</dict>
change this section to:
<key>telephony</key>
<true/>
<key>telephony</key>
<false/>
& click save then done.
Then sync!
i hope this tweak works on all ipad and ipod touch
i have tried it successfully on ipod touch 3g