Looking for a new phone.

I'm looking for a new phone. I'm a big fan of Huawei and all my phones in the past were Huawei. I'd buy the Huawei p40 if it wasn't for Trumps ban..

What I'm looking for in a phone:

• excellent camera
• great battery life (at least 4000mAh)
• if possible: not a curved screen
• compatible with my Fitbit versa 2

I was thinking about samsung galaxy s20 but read some reviews that said the battery life is not good. Then I thought about the one plus nord but they didn't confirm yet it will work with the fitbit.

I'd rather not break the bank but I'm okay with paying max €800 if it's an awesome phone!

(I'm from Belgium and don't want to buy a phone with a phoneplan. Cause it will cost double of the plan I have now and I won't need it, already have limited data for €19)