One thing I noticed after un-boxing my Nexus 5 and getting it setup is when Google asks you for your email address and password it will launch a chrome session to sign into if you have 2-step verification enabled. On my Google account I have a 2-step Verification enabled so any time I log into a browser or session that is unknown to Google it will send a text or call my phone with a verification code to enter in a browser.
When conducting the setup on your new Nexus 5 and you have 2-step verification enabled on you Google account make sure it is disabled under Google Settings/Security momentarily so that the process is easier. Otherwise you need to swap the SIM card again to get the code from your old phone.
When conducting the setup on your new Nexus 5 and you have 2-step verification enabled on you Google account make sure it is disabled under Google Settings/Security momentarily so that the process is easier. Otherwise you need to swap the SIM card again to get the code from your old phone.