WhatsApp populates the lists with your phone's contacts, so it's a big deal if they don't show up. There could be a number of reasons why WhatsApp couldn't discover contacts on your device.The contacts are not configured as visible, which is one of the most typical issues here.
International Contacts Aren't Recognized By WhatsApp
Many of us have experienced this: we type in a foreign number and it does not appear in our contacts. The trouble is, every foreign phone number requires a code to be placed before the actual number. If you want to add a number that belongs to someone in the United Kingdom, for example, you'll need to put +44 in front of the regular number the number will not be recognized
