iphone 4 whatsapp pliz
 

can't register with this phone number .You can only register with the phone number that was last used with WhatsApp on this Phone"?

i have same problem
i also jalbreak intall whatsapp old app tweaks but can not fix..

try this proces old apple id or jailbreak phone and next itunes

uppp upp broo upp hhhhh upp

up ajjjab up upp uppp brother next comment

Solution WhatsApps iphone 4 ios 7.1.2

solution phone jalbreak link

solution phone no jalbreak link

if any one not remember previous number
how to activate

Uninstall the actual version and install an older version (2.18.80 works fine). You must use 3utools to get the job done.

Beware! mysostech ask for money
 

mysostech ask for money for the 2.18.80 version of whatsapp.
Can anyone upload a good IPA, or share the apple ID for using it?

Working solution
 

I have tested this today. I can confirm it is working 100%.
Look at this thread!