TORONTO - The Federal Court of Appeal has rejected a bid by the country's wireless service providers to delay the implementation of the wireless code of conduct.

The CRTC introduced the new code in June, 2013 to give consumers better protection against high cellphone roaming charges and wireless contract cancellation fees.

Wireless operators including Rogers Communications, Telus and BCE Inc. launched legal action last July after raising concerns that some provisions of the code would apply retroactively to all of their customers once fully implemented.

In writing the decision for the three-member panel, Justice Denis Pelletier said the CRTC "has the right to make the wireless code applicable to contracts concluded before the code came into effect."

Once in force, the wireless code would require carriers to limit early cancellation fees, data roaming fees and overage charges, and imposes restrictions on the locking of wireless devices.

The code will apply to all customers, regardless of when they signed contracts.