The IMEI (the serial number of your phone) is required to first check the compatibility of your model in North America.
You can either put IMEI 1 or 2, this is not important as this the same smartphone model.
You can insert the sim card in any compatible device afterwards. There is no restriction.
For eSIM activation, if you change the smartphone before activation we need to update your IMEI & EID, please contact us.