First setup of iPhone SE without WiFi and iTunes
Suppose the situation you bought iPhone SE in an area where is no WiFi (or you need to tell the iPhone's MAC address to the system administrator first) and you do not have a computer at all. How to get through the first setup wizard?
iPhones require a connection in order to set up, because the set up process requires the phone check in with Apple, even if it isn't set up on a carrier yet.
You can either use the carrier (if you have an active SIM), WiFi, or a computer. If you don't have any of these there is not a way to set up the device.