By Staff Reporter WINDHOEK Telecom Namibia has announced that as from midnight tonight, Friday, February 2, until 06h00 on Saturday, February 3, it will be carrying out software upgrade work on the Tsumeb exchange. Onsite preparations for the upgrade are already in progress at the town. Telecom says the Tsumeb upgrade work would affect all fixed-line telecommunication services in the north-east of the country, specifically in the whole of the Caprivi, Okavango and Otjozondjupa regions, as well as parts of Oshikoto Region. All customers with telephone numbers starting with 066xxxxx and 067xxxxx in the above-mentioned regions will not be able to make or receive calls during the period of interrupted service. The company advises that any complaints or problems customers might experience after the planned service interruption, should be reported to its Customer Service Centre at 1155. In its statement, the company said the Tsumeb upgrade follows similar successful upgrades of EWSD exchanges in Windhoek, Keetmanshoop and Walvis Bay. It will upgrade all other EWSD exchanges throughout the country according to a pre-determined schedule. Telecom Namibia apologizes for any inconvenience this interruption may cause customers, and trusts they will benefit in the long run from an upgraded telecommunications network.