[5] The company was founded in 2001 by telecommunications corporation OTE group, from 2005 to 2013 it was part of the Cosmote brand line of the group, since August 2013, is 100% owned by Norwegian telecommunications corporation Telenor which acquired it from OTE in for EUR 717 million.

[9] In March 2018, Telenor sold its business in Central and East Europe (Bulgaria, Hungary, Montenegro and Serbia) to the investment fund PPF, for a sum of 2.8 billion euros.

The name change was a part of the wider rebranding initiative in Bulgaria, Hungary and Serbia where the PPF’s Telenor branded businesses operate.

[11] In 2023, it was reported that PPF was considering selling its stake in Yettel to UAE-based Telecommunications group e& (Etisalat).

In mid-2003, however, mobile numbers in Bulgaria increased by one digit (by adding an initial -8-) and the network code changed to 089 only.

Alongside Globul, OTE had also owned one of the two public telephone networks in the country – BulFon, which it sold back to the Bulgarian Telecommunications Company in 2005.

[16] Telenor Bulgaria offers 4G services under the LTE standard in the 1,800 MHz band to all of its customers from 1 December 2015 in 53 cities and 2 resorts with coverage to 56.73% of the country's population.

By mid-December, Telenor's LTE service will cover all Bulgarian cities with a population of more than 20,000, including all regional centres and the most popular winter resorts.

[19] Telenor said it will continue to expand the coverage and the capacity of its LTE network, depending on spectrum availability, further into 2016.

Users with older SIM cards will be able to replace them free of charge at any Telenor or official partner shop where a wide variety of 4G-enabled devices is also available after 1 December.

[19] In April 2016 Telenor announced that its LTE network covers all residential areas with over 5,000 inhabitants and provides fast data transfer for 75% of the Bulgarian's population.