The answer is yes, you can manage more than one account. Multiple accounts are allowed, up to four. You can even use both the Original version and GB version at the same time on a device. It is necessary to have two separate phone numbers. You will automatically lose access to your official WhatsApp account if you sign using the same number on GBWhatsApp. So that if you are using official WhatsApp on your phone, you're required to have a secondary number.