I'm going to do the entire MN section of the North Country Trail.
It can be seen here: http://northcountrytrail.org/trail/states/minnesota/
I'll be starting in Tamarac National Wildlife Refuge and ending in Jay Cooke State Park. There will be a few days of road walking, including using the paved Mesabi Bike Trail to get from Grand Rapids to Ely.
My main gear quandary right now is whether or not I will need the large pot and the Whisperlite, I've been hearing mixed things about the conditions and water availability in Northern MN. I still would really like to bring my titanium Snow Peak .9L pot, Vargo Hexagon Wood Stove, and ESBITs, a 3-season non-winter cook system. Much much lighter.
To answer your questions
The cell phone is probably unnecessary, won't work in the BWCA, but could be convenient. I've been debating leaving it behind ever since I got the SPOT. The SPOT will be really useful from a safety standpoint in the BWCA, but otherwise is more for my family and friends.
I'm bracing myself for nighttime lows into the teens. Those temps are actually showing up on the extended forecast of where I'm going. Even if I'm only bracing for one or two nights at those temps, better safe than sorry. As far is camp comfort goes, I'll be able to do camp chores with what I have, but I won't be too comfortable outside of my sleeping bag, which is okay. This trip is about the mileage.
Yep, I thru-hiked the AT with a rain kilt. It's only real function is to prevent water from running right down your butt. The kilt can keep me comfortable in colder rain if I find myself needing something on my legs.
I use a headlamp. I put it on the gear list as my Black Diamond.
EDIT: Forgot about the tenacious tape. I like having something that can be relied upon to fix something really serious like a water bladder break, tarp rip, something like that. I've carried ripstop tent repair stuff in the past, this is a replacement.