My approach to the problem
I am a year round commuter and do not carry a phone. I fight flats with a number of approaches.
1) Velox Rim Tape
2) Change out the tubes every year, if water / snow / ice and salt gets on the tube it seems to deteriorate a tube by making them less expandable causing splits
3) 4 pumps of Slime, that takes care of the slow leaks
4) Schwalbe Marathon 365, first line of defense
5) Mr tuffy, 2nd line of defense against larger objects
6) Bike pump
7) A spare tube, use this first to get back on the road fastest
8) A handful of Park no-glue patches, use this if I did not catch what caused the flat
9) Cold vulcanizing patch kit, use this if I run out of no-glue patches
10) 6" of Duct tape to deal with a tire issue
Got it down to 1 or 2 flats/year