This may be too technical a question for this forum, but here goes -- I have Time Warner Cable plus my own wifi router. Never had troubles. But recently each morning I wake up to find that, while I can reach my router via wifi (router settings), I cannot hit the internet anymore (via iPhone, macbook, or anything else). Which means my phone, which was plugged in all night, and on WIFI, and expecting to receive notifications and stuff over THAT connection, might not have been doing so for much of the night, right? Does the iPhone (iOS) notice that, while it has a wifi connection, it does NOT have internet access anymore? Does it switch to listening for traffic on the cellular connection? Or is it not that smart and it basically goes radio deaf to everything but phone calls and non-iMessage texts? Anyway, I have to reboot the modem and/or router each morning and then it's good again.