I am hoping someone can help

i have iphone 4 with 4.2.1 firmware and i installed Whatsapp and have been waiting for over a week for the 3 digit activation code i have email support i have tried everything

i also have a iphone 4 with 4.1 firmware i have put it on that phone it doesn't ask for the code and i can use the app but it doesn't stay connected when the phone goes to sleep it disconnects and i don't receive msgs

any ideas would be great i need this app to talk to my sone overseas thanks