The fight: Internet talk and text apps
Finding the right VoIP app can help keep your phone bill under control. Are you already using the best one, or is it time to try something new?
Skype: Free IM, voice, and video calls to Skype users. Low-cost calls may let you try a cheaper cell plan, says CNET's Rick Broida.
Viber: Call or text any Viber user for free. Automatically searches your contacts for other users. No ads.
Skype: The free service is supported by ads targeted to your age, gender, and location. The premium service costs $4.99 a month.
Viber: Routes calls to non-Viber users through your cell plan. Video calls not supported.
Skype: Yes, the ads are annoying, but Skype is still the more useful choice. Until Viber lets you talk to people who don't have the app -- without using your cell minutes -- the service stays at No. 2.
Availability: Both apps are available on the iPhone, Android and Windows Phone. Skype is available on its website. Viber is also available on the BlackBerry.