Ok, you have an Amazon Echo, a home 2.4 GHz home network, but no cell phone? I believe to set up the TP-Link devices, you need to run the Kasa app, which will run on iOS or Android. If you have an iPhone, iPad, or an Android device, you should be able to set the Smartplug up to work with Alexa. Although you don't need the app to actually use the device, meaning you could just borrow an iOS or Android unit, I think this would be frustrating in practice. However, you do NOT need cell service that I am aware of. I'm not familiar enough with other units to recommend an alternative that would not require an iOS or Android app.