Reliance Communications said it was having trouble in rolling out WiMax services because of shortage of spectrum allotted to it.

“Given the spectrum constraints we have, it is possible to accommodate only a limited number of subscribers. As a result, the cost of services will remain high,” Sumit Chowdhury, chief information officer of Reliance Communications, has said.

Reliance Communications has got spectrum in the 3.3 GHz frequency band and is planning to introduce retail WiMax services in 12 cities in the next three months.