One Network enabled its subscribers in Kenya, Uganda and Tanzania to roam free between these countries, thereby scrapping roaming charges, making calls at local rates, receiving incoming calls free of charge, and recharging with local top up cards.

The One Network automatically activated upon crossing the geographical border into one of the six countries with no prior registration or sign-up fee.

[2] In September 2007 Celtel's Parent Company MTC Group adopted a new name Zain (Arabic for ‘beautiful, good and wonderful) unifying its different brands in 22 Countries.

[3] In October 2007 Celtel International Acquired a 75% stake in Western Telesystems LTD (Westel) from the Ghanaian Government for $120 million US Dollars.

[3] The One Network is still operated in Africa today by Bharti Airtel in association with Zain and Cell C. On 29 March 2005, Zain Group, then known as Mobile Telecommunications Company (MTC), announced that it would acquire 85% of Celtel International for US$2.84 billion with the option of acquiring the remaining 15% after two years for US$520 million.