Will my Whatsapp account/chat history still be there after reverifying my number on the old phone?

If I have my SIM in a phone, then I took it out and put it in another phone and verified the number there, the account on the old phone won't be active. After 2 months or so, will I still be able to put the same SIM in my old phone again and have the account reactivated with my old chat history?
Unfortunately, I haven't backed my chat history up on my main device, so I was wondering, after being deactivated due to the SIM being used on another phone, will I be able to reactivate it again and still retrieve all my chats that were on the device?