If you use 2nd router as a repeater/range extender the 2nd router should have the same ssid. You should not be able to manually pick routers from your phone in repeater mode.I've a long house and have access points at each end. The phone stubbornly sticks with one (Asus RT-AC66U) regardless of signal strength. The other is an older TP-Link AP, even when I'm almost on top of it I have to manually switch. Any clues on how to get it to pick the strongest signal? It's a small nit, otherwise this is one of the nicest devices I've ever used, I'm coming off a Nexus 6.