In case you find yourself in trouble here are some useful links and some emergency telephone numbers that are for free to call from any Greek phone!
Fire department: 166
Police station: 100
Pharmacies on duty: http://www.xo.gr/farmakeia-efimereuonta/thessaloniki/
Hospitals on duty: https://www.xo.gr/efimerevonta-nosokomeia/thessaloniki/
***If you cant find what you want and its an emergency, call 112.***