It cannot. Tell time. Properly. Without access to a cellphone network. This astonishes and infuriates me. I am literally angry with rage!
The alarm clock feature seems to work, with a notion of time that fixes midnight at the first time the cellphone noticed it was no longer in Verizon-network-Kansas anymore. Which cannot, as far as I can tell, be changed, or even displayed on the main display.
Anyway. I am safely in France, with a bed, and some talk slides written, and some free wireless at the hotel, and most of the Amber Spyglass left to read, and a laptop with a running-down battery, and