According To Nokia Nigeria, This Whatsapp is Available for Download at Nokia Ovi Store. You can also get it at Whatsapp official Website
It is also Important To note that only Two Asha Dual Sim Phones; Asha 310 and 308 are compactible for Whatsapp for now. We are looking forward to the compactibility of other Dual sim asha Phones.
About Nokia Asha 310
Asha 310 is Nokia's first smartphone to feature both Dual-SIM and Wi-Fi capabilities, Asha 310 features the EasySwap Dual SIM technology , 2GB/4GB card which can be further expanded to 32 GB, 40 free EA games and slew of social networking tools and Nokia Maps which work both online as well as offline. This full-touch device sports a 3-inch display, basic 2-megapixel camera and a impressive battery life offering 17 hours of talk-time and up to 25 days on standby from a single charge
About Nokia Asha 308
This dual-Sim smartphone from Nokia comes witha 3-inch screen with a QWVGA resolution of 240x400 pixels. The device is also equipped with a 2-megapixel fixed-focus rear camera, Xpress browser that compresses data upto 90 percent making browsing and streaming content seamless and cheap. The device is also loaded with 40 free Java games, 20 MB internal storage with 32 GB support via microSD card, 800 MHz processor and a 1110 mAh battery..
Credit - KnowYourMobile.com