 The new code was expected to go into effect in late 2015 but has again been delayed by Serbia until March 2016. The geographic phone code was implemented in December 2016.
<clarity>  The new code was expected to go into effect in late 2015 but has again been delayed by Serbia until March 2016. The geographic phone code was implemented in December 2016.
 After some delays, the new geographic phone code was implemented in December 2016.