There has been a lot of discussion here about using Voice over IP (VoIP) to save on long distance costs, but I haven't seen anyone mention using it to reduce basic cell phone charges. As mentioned in this article, VoIP is a good way to avoid over running your cell phone minutes, particularly if you have WiFi available. Softphone clients are available for many smart phones and the latest version of Android has one built in. One softphone that's available for free for Android and iPhone is 3CXPhone. It may even be possible to get a data only smart phone plan and avoid the voice plan charges entirely. As I have mentioned previously, 4G phones will be VoIP exclusively.