Here is an electric blanket that you can control easily with your smartphone. The Sunbeam LoftTec WiFi Heated Blanket has 10 heat settings. You can not only control it with your smartphone but also Alexa and Google Assistant. It also has a controller with a backlit digital display.
The cord and controller are removable, so you can wash and dry this blanket with peace of mind. You can find out more about it here.