In the event of a crisis, help will go to those who need it the most. You should plan to be able to manage without the help from society for at least a week.
If you become ill or get injured while in Sweden, call 1177 for information about illnesses and where to find your nearest healthcare centre. In case of emergency, call 112 for an ambulance.
In the case of long-term internet or telephone outages, information from the responsible authorities will be available through other channels than when things are working. This is how authorities will inform you in such circumstances.