Problem in getting varification code in my samsung chat on gt s5

Hello, sir in my samsung chat on s5222 i have downloaded whatsapp but when i am entering mw phone no. And selecting country after that i am clicking on get verify code it is not giving cod till 5 munites after that it is showing network problem .

Please solve the problem if i have downloaded the wrong app then please send me the correct linw on my phone no. **** [you shouldnt be giving out your phone number - edit by Moderator Brian Green]