I turned my old Android phone into a Wi-Fi extender and fixed the internet dead zone in my home

Turn your spare phone into a Wi-Fi extender ...

How to turn your old Android phone into a Wi-Fi extender - and fix dead spots at home

How to turn your old Android phone into a Wi-Fi extender - and fix dead spots at home ...
Ars Technica

Any issues with setting a wifi extender to the same SSID?

I have walked about with both a laptop and some iOS devices and it seems to have no trouble handing off between the main router and the extender. Any snafus to be aware of? The extender wifi is slower ...