Hi Iris92
feel welcome here in the forum!
Not sure how much “de-googled” you would like to have your phone at all.
Here´s a pretty good analysis by a german security researcher that took a deeper look at CalyxOS’ traffic and behavior:
It´s in german but that´s no big hurdle nowadays, right? 
Just pick your favorite translation service and read that article in your favorite language.
Essence of that article is:
CalyxOS is low-googled but their promise of being fully de-googled is (not yet) true
Best
DonFnord