The moment you switch phones, all the data is lost, because they do not have it in the cloud! This is the reason your phone needs to be connected to Internet when using whatsapp web or whatsapp desktop, because they literally stream your data i.e. chats from phone to desktop!
Telegram is a cloud messenger, data is stored in the cloud and loaded everytime in your devices, ironically this makes whatsapp better than telegram :D at least before facebook bought it.
Whatsapp never stores the chat history anywhere. All conversations are encrypted end to end.
It says on the Nokia C3 version of the app that Whatsapp won't support that device next year, possibly because of that.
I didn't say you can't, I said Whatsapp doesn't store it. I meant to say that it won't automatically backup and restore your stuff when you change phones.
You have to backup the data yourself in an sd card or a cloud service that you choose. It isn't stored in Facebook's servers.
Just to say this didn't happen with Telegram. Recovered everything smoothly with no errors.