More articles by Adam Stone

Move over Nextel, there's a new push-to-talk solution, BeOn, from Harris Corporation that runs on 3G and 4G networks.

Mobile VoIP continues to grow in popularity, with mobile downloads of the technology increasing at a rapid pace.

Already available for Symbian, Android, and Microsoft Windows Mobile devices, VPhone recently joined the near-endless roster of mobile apps available through the iTunes App Store. These and other mobile VoIP apps can help mobile IT manage wireless costs.

Skype is making inroads into the enterprise as its latest business offering enters a new phase.