I believe your phone is telling you that it cannot find the network provided by the Quantum altimeter. I never want to assume, so some really basic questions (no offense is intended), but step one: is the Quantum powered on - meaning connected to a fully charged battery? It seems odd that it was connecting for you before, but now it is not. Do your wires going into the Battery + and - through-holes in the PCB look okay? If you check those solder connections with a voltmeter (put red lead from DVM on the Batt + connection, black lead on the Batt - connection), what voltage do you read? How about your resistor leads that connect your Quantum PCB and WiFi module - do they all look good? If you look at all available networks, what do you see? Maybe send a screenshot of that if possible.