The country calling code of Serbia is +381. Serbia and Montenegro received the code of +381 following the breakup of the Socialist Federal Republic of Yugoslavia in 1992 (which had +38 as country code). Montenegro switched to +382 after its independence in 2006, so +381 is now used only by Serbia.
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Serbia has a developed and efficient telephone network infrastructure. Domestic line system is 100% digital, with digital cable trunk line connecting switching centers. A drop in fixed-line connections in the last decade has been more than offset by a sharp increase in mobile-cellular telephone use.
Per wikipedia:Summary style, the main article where this should be debated is Telephone numbers in Kosovo, and only summarized here very briefly, rather than forked in its entirety. I don't think that having the entire history in this article is appropriate.
Fixed telephone lines connect 81% of households in Serbia, and with about 9.1 million users the number of cellphones surpasses the total population of by 28%. The largest mobile operator is Telekom Srbija with 4.2 million subscribers, followed by Telenor with 2.8 million users and Vip mobile with about 2 million. 
After April 1, 2004, the phone numbers can be carried from network to network. That means any of the previous codes can refer to any mobile provider. There's internal roaming between Telenor and Telekom.
The country has an open telephone numbering plan, with most numbers consisting of a 2- or 3-digit calling code and a 6-7 digits of customer number. The country calling code of Serbia is +381. An example for calling telephones in Belgrade, Serbia is as follows: xxx xx xx (within Belgrade) 011 xxx xx xx (within Serbia) +381 11 xxx xx xx (outside ...
some local phone codes: Belgrade (+38 I II) Nis (+380 I8) - Kragujevac (+38I 34) - Novi Sad (+38I 2I) Subotica (+38I 24) - Potgorica (+38I 8I)
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