Base was founded as Belgium's third mobile network operator in 1999 under the brand name of KPN Orange. It was a joint-venture between the Dutch KPN Mobile and the, then, British Orange Mobile telcos. After the take-over of Orange mobile by France Télécom it's shares in the company were sold to KPN Mobile. After a few years the brand name was changed from Orange to Base.
Base has an estimated 98% coverage of the country and 23 % market share.
The Base network is used by a number of mobile virtual network operators: Simyo (KPN), Tele2 Smart (Tele2), Aldi Talk (Medion Mobile), 1 Mobile (Carrefour), NRJ Mobile (NRJ Radio), Ortel Mobile (KPN), Al Yildiz, JIM Mobile (VMM), Mobile Telecom, Ello Mobile, Caleo Mobile, DixiTel, Ilyacom, Inphony Mobile.
The operator's display logo is BASE, the net code is 206 20 and operates under GSM 900/1800 net frequencies (2G GSM). Its prepaid service is called Base Prepaid.
Since 2005, the Base corporate identity and claim "freedom of speech" are also used by German operator E-Plus, also a subsidiary of KPN. E-Plus used the brand to promote a flatrate in which all calls to landlines and within the E-Plus network and all text messages within the E-Plus network are covered by a monthly charge of 25 euro.