The cheapest and easiest way of calling home from Bulgaria is by using one of the two brands of calling cards:
Mobika (the card and the phone sets are coloured in blue; 300 pulses = $6)
Bulfon (a bit more expensive; coloured in orange)
Using the internet may result more comfortable. There are internet cafes in all cities charging $0.50/hour (better have a book with you while waiting for the sites to open) and $1/hour (good quality internet connection).
The following numbers are free:
*Police -166
*Ambulance -150
*Fire brigade -160
In the majority of cases, you will need the help of a Bulgarian to understand what they answer you on the phone.