In order to get the best experience from WhatsApp, we
strongly recommend that you allow WhatsApp access to
your phone's Contacts. Here are a few things to know
about using WhatsApp with your phone's Contacts.
How WhatsApp uses my contacts
You can learn more about how WhatsApp uses your
phone's Contacts from this FAQ article. In short, we value
your privacy and we have not, do not, and will not ever sell
your personal information to anyone.
How to access my phone's Contacts
If you initially denied WhatsApp access to your phone's
Contacts, you can enable access by going to the
BlackBerry 10 Permission Settings:
― From the BB 10 Home screen, swipe down from the top
edge of the screen.
― Go to Settings > Security & Privacy > Application
Permissions > WhatsApp.
― Make Sure Contacts is set to "On".
― Reboot your phone to ensure any changes take effect.
WhatsApp should automatically detect the contacts from
your address book. To manually refresh your Contacts:
― In WhatsApp, swipe from the left edge of the screen to
reveal the Overflow Tab.
― Tap Contacts from the Overflow Tab.
― In the Contacts tab, tap the Action Menu button.
― Tap Refresh Contacts.
Contacts Sources
If you have granted the app permission to use your
contacts, but WhatsApp is still not detecting your contacts,
or is displaying phone numbers without names, your
contacts may be saved in a source that WhatsApp does
not have access to. WhatsApp should be using the contact
info (such as First name, Last name) from the contacts
that are saved in the SIM, local, or Google/CardDav
accounts on your phone.
Contacts from Social Networks
Third party apps, such as WhatsApp, do not have access to
the contact details that are saved in social network
accounts, such as Facebook or LinkedIn. It is possible, e.g.,
to have a contact in your phone that does not have a first
name or last name, but does have a phone number. This is
particularly common with contacts that are linked to a
social network account, so make sure to save your
contacts locally on the smartphone.
WhatsApp and BES-configured phones
If your BlackBerry 10 device is configured with BES, you
will likely have contacts from the 'Work' profile, which
WhatsApp is not able to access. Similar to contacts from
social networks, please ensure that your contact details
are saved to the SIM card, locally to your 'Personal'
profile, or to a CardDav account, such as a Google
account.
Cheers,

my z10 don't refresh contact except with wifi, can't you assist me with the settings?

If I set watsapp to access my contacts, wat wud be d effect