MNP, which enables subscribers to change operator while retaining their mobile numbers, is to be rolled out across the country on January 20.
"Idea's new toll free number 1800-270-0000 will offer all relevant information on the processes and procedures of availing MNP and porting requests from mobile subscribers who wish to switch to Idea," Idea Cellular said in a statement.
The helpline is being promoted through a television ad launched recently, besides other media platforms, it added.
"We realise that mobile users are awaiting MNP to switch to a network which offers seamless connectivity, superior customer service, and affordable and relevant products and services," Idea Cellular Senior Vice President (Marketing) Anupama Ahluwalia said.