LOL! they think when the SHTF there iphone will save them! I say first 30 days 50% are dead! After that there will be another 20 to 25% that will make it 60 to 120 days taking things like food and water from others until they meet one that will kill them.
The real store is maybe 20% will make it.
I do not think in the city it will matter if you are clean or not, once there is no food or water they will just kill you for it. Cities will be war zones. The gangs go for the easy homes, they will not go for the homes that are shooting at them. The cities have to many homes with people that will not be ready for them.
I do know that in my block we are all armed to the tee. So if it happens pray for me.