but americans can buy the phones without contract/plans like you want to buy a factory unlocked phone here it's your preference yet you don't want to go all in and looking to cut corners.
So i just stated your options also those carrier phones work perfectly fine here and globally if you get the correct one.
You can get T-mobile/Sprint if you don't like logos also its your personal opinion so can't count it anyway
You can get a Carrier phone without logos, also you are someone who uses your phones with covers as you mentioned earlier that One plus one 3 won't have those accessories here so you are using your phone with cheap chinese covers and you are telling me that you have problems with logos from american carriers
also those covers you use hide logos and the beautiful back of the phone.
the shopkeepers don't sell those phones for cheap prices they get what the highest they can get for the devices because they can't sell the phone for a boxed packed phone can they ?