Whatsapp: Switching from iPhone to Android. Do I lose service?

I've purchased Whatsapp on iPhone. I've got a lifetime service now. If I switch to Android, will I have to purchase Whatsapp again from the Google Play store?

Thanks

Added (1). Going from iPhone 4s to galaxy note 3

WHY YOU DOWNGRADE

They are unrelated, you would have to purchase agan. Upgrade to 5S as you can trade in your old phone now to get money off.

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