If you wish to call someone without using minutes on your iPhone's cellular plan, the Skype Voice Over IP (VoIP) application for the iPhone enables you to instant-message and call anyone who has a Skype account for free as well as call users who don't use Skype if you purchase a calling plan, according to the official Skype site. As of July 2010, the Skype application is available for free in the App Store on your 3G iPhone and can be used by accessing your phone's cellular network or a WiFi connection.

WebEx is a conference call application for your computer developed and provided by Cisco. Sharing your documents as well as your video image are a few of the advantages of using the WebEx service to facilitate your conference calls. Cisco charges a monthly subscription fee. However, you can get a free 14-day trial period to try it out. After signing up with Webex, setting up a Webex conference call is simple.

Skype is a Voice over Internet Protocol (VOiP) service that you can set up on your PC to receive free calls from other Skype members. Once you download and install the Skype program on your PC, you can make and receive calls from other Skype members. Skype also allows you to send and receive text and instant messages, transfer files, screen share, and make conference and video calls. Skype offers both paid and free services.