Personally, I did not use a bear bag for either of my LT hikes. I understand that there was a problem bear at Seth Warner in 2009, so I did use the bear box that was installed at the shelter. But, other than that, I just used the mouse hangers inside the shelters.
I used a Tracfone in Vermont which hooks into Verizon’s CDMA network. I had good, but intermittent service. The mountain tops are good places to try your phone, as are road crossings. But, it’s spotty. As an example, I had service on Glastenbury, but not on Mt Horrid. On most days the phone would work at some point during the day. Up north, the service got poorer. Overall, I’d say that Verizon worked pretty well.
Loup