This applies to Bugging-Out from work and heading home:

If EMP doesn't kill my computer (laptop), then I put in the air card and if the 'putor is fully charged, I will have comms capability for 3 hrs of air time. Providing the cell towers still work.

If my cell phone still works, then I have voice and/or text capability for approx 3hrs of air time. Providing that the cell towers still work.

Any electronics that have been killed by EMP is that much less weight I have to carry in my "Messenger Bag", which leaves room & weight capacity for more water. I will need as much water as I can carry just to get through some small metropolitan areas before I can get to the woods.