Sprint Corp., the nation's third-biggest cellphone carrier, is cutting an unspecified number of jobs this month to reduce costs as it tries to better compete with AT&T and Verizon, and hinted that more layoffs are possible.

Sprint spokeswoman Roni Singleton wouldn't disclose the planned number of October job losses, which will include employees in management as well. She says the wireless carrier has previously said cuts would come in its IT, portfolio management, network and technology divisions.

Sprint said Friday in a regulatory filing that it will book a $160 million charge in its fiscal second quarter to cover this round of layoffs, which will largely be completed this month. It may take more charges for future job cuts.

The Overland Park, Kansas-based company has posted billions in losses for the past several fiscal years as subscribers canceled contracts. It shut down its struggling Nextel service last year.