Some months ago I had to return a phone to the store and all I did was factory reset to erase everything. Now I'm getting paranoid about how safe my information is and if it's possible to recover it. I've heard that modern android phones have an encryption system tied to the pin or password. The thing is that I think I didn't have one for the phone and I'm wondering if my information is still safe or it can be recover easily

Some months ago I had to return a phone to the store and all I did was factory reset to erase everything (I did it two times too). Now I'm getting paranoid about how safe my information is and if it's possible to recover it. I've heard that modern android phones have an automatic encryption system tied to the pin or password. The thing is that I think I didn't have one for the phone and I'm wondering if my information is still safe or it can be recovered easily