ArmenTel Company has revealed an unexplainable overcharge of its network, Chief Executive Officer Vasilios Fetsis told journalists. In his words, strange failures that are not connected with technical defects have occurred in the cellular communication system since July 1. The causes are being investigated at present. According to Vasilios Fetsis the failures are cot conditioned by the increase of the number of subscribers or functioning of the equipment. To remind, till November 4, 2004 ArmenTel has held the monopoly for the cellular communication in Armenian market. In 1997 OTE Greek company purchased 90% of the stocks of ArmenTel Telecommunication Company with $142.47 million. Since July 1, 2005 K-Telecom entered the Armenian market under the trademark of VivaCell. According to Mr. Fetsis ArmenTel will undertake all the necessary measures including legal ones to protect its network, Prime-Tass reported.