It is a lack of communication at the store level. They believe that it requires some special SIM, and their reasoning behind not having it is "Sprint doesn't officially support the device until Friday."
Thanks for the post. here are some tips on this new device.
Customers may also switch 4G LTE UICC cards from their old device over to the Nexus 5 if it is compatible and paired up in Ensemble.
Sprint Social Care
Thanks for all your help with everything, you guys are a huge help with everything.
Its just that the store employees are clueless that the SIMS from the above stated devices work.
They need people like you working there