[Q] Suggestion for basic Android phone please topic

Hello,

U.S. user here...I currently have a Samsung Galaxy S4 (stuck with ATT) that I absolutely don't like. I'd like a basic android phone that has

• bluetooth


• a removable battery


• will allow me to flash a custom rom


• run the barebones needed

I don't run apps - other than mail and sms. I despise Samsung's crapware and their desire to listen in on anything going through the phone. Screen size isn't important.
Thanks!