Telephone numbers in Serbia
Calling code areas in Serbia have been largely unchanged since the time of Socialist Federal Republic of Yugoslavia.Calling code areas:[2] Until 2013, Telekom Srbija had a monopoly on fixed telephony services.However, since 2011 customers can change the operator and retain the old calling code (along with the rest of the phone number).It is not possible, however, to transfer a mobile number to a land-based operator and vice versa.[6][7] Kosovo declared independence from in 2008, but retained the +381 calling code only for fixed telephony until 2016.