U should receive an sms verification from whatsapp services, as i remember it's a 4 digit code, did u?
If so just enter the code and press verify
If verifying failed it mean either the whatsapp server down or u have problem connecting to it
In middle east some country blocked whatsapp for political unknown reason, where u connectting from?
Or try unable any firewall if exist
You may try proxy or vpn connection.... Serch play store for vpn clients
If you current cell number is blocked from receiving sms from whatsapp services u may try any of those free sms client and get a random free phone number, it should be a number with A US country code, apply to whatsapp setup and receive the sms via the sms app and you are good to go
Sent from my GT-I9505 using XDA Premium 4 mobile app