I carry an extra 25' charging cable I got from monoprice in a lockable top case. Not cause I ever worry about someone stealing it, just if I need extra length. But it does act as a backup.
On the other topic, I don't forsee Zero having a cellular connection any time soon like most electric cars do, just because of additional cost to the base price of the bike, and the cost of development.
However, if you always use ChargePoint stations as do 98% of the time by choice, it will send me an alert if the bike stops charging for any reason, and it has come in useful many times. A few times there was a charger error and I was able to go back and restart it. Most times I use it to tell me when to leave my lunch or dinner table and return to the bike as it's done charging.
When many of you either get the Zero charge tank, the Hollywood Electrics Elcons, or the DigiNow supercharger and a J1772 plug, you will see this is even more handy.