My Nexus 5 which I got brand new is not connecting to Koodo at all. It happened randomly and all of a sudden, "it says cannot register on this network please try again later" The sim card though works on other phones. I have restarted and done everything, what else can I do?
Unplug the battery and sim card from the phone. Also, if this doesn't work you have 14 day money back guarentee. So I would suggest bringing the phone back to the store if this troubleshooting step doesn't work. The store will replacement the phone for you (same model) at no cost.