@Ephs 

Hi,

Try using http://192.168.0.254 instead. That's the default IP address of a new RE305.

If that doesn't work either, then verify that you are indeed still connected to the RE305's Wi-Fi "TP-Link_Extender". Modern phones (or actually most modern client devices) have been designed with the annoying behavior of disconnecting themselves from Wi-Fi networks that don't provide an active Internet connection.