Millions of Israelis around the country were left unable to make cell phone calls or send text messages Wednesday, when a technical glitch brought down the servers of Cellcom - one of the big three Israeli cellular phone companies.

Cellcom said Wednesday that the halt in services had been caused by a fundamental and complex network problem.

"There is a problem in the heart of the system," a spokesman for the company told the Israeli media.

Cellcom said that there was "a temporary difficulty for some customers in making and receiving phone calls."

"We are now working on restoring full service in the shortest time possible," the company said

Company director Amos Shapira said the problem was a computer glitch that caused a whole chain reaction, and that Cellcom does not know how long customers will remain without service.

He told Israeli TV on Wednesday that the breakdown is the worst malfunction Cellcom have ever had.

Israel is one of the biggest users of mobile phones in the world, with a reported 1.38 cell phones per capita.