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.
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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.
Serbia and Montenegro, however, shared the +381 code until 2006, when Montenegro was given the +382 code by its independence. The +388 code was not used by Montenegro, but for the European Telephony Numbering Space. The +380 code was assigned to Ukraine.
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. 
Telephone numbers in Serbia From Wikipedia, the free encyclopedia Regulation of the telephone numbers in Serbia is under the responsibility of the Regulatory Agency of Electronic Communication and Mail Services (RATEL), independent from the government. The country calling code of Serbia is +381.
Pages in category "Telecommunications in Serbia" The following 3 pages are in this category, out of 3 total. This list may not reflect recent changes ().
89% of households in Serbia have fixed telephone lines. There are over 9.60 million cell-phones users. This is larger than the number of the total population of Serbia itself by 30%.
A telephone number is a sequence of digits assigned to a fixed-line telephone subscriber station connected to a telephone line or to a wireless electronic telephony device, such as a radio telephone or a mobile telephone, or to other devices for data transmission via the public switched telephone network (PSTN) or other public and private networks.