As smart phones become more and more common, there is a big push to use them instead of having to visit the office to send and retrieve important data. Smart phones are, in some cases, a lot more efficient and cost-effective than having a full office setup with a desktop computer since you're able to remain on the go and able to send and receive important data without having to anchor yourself to one place for too long. Some applications are even flexible enough to allow their desktop counter-parts to sync up with the mobile version as is the case with Google's calendar app.
Mobile online calendar sharing tools are fantastic because updates can be made even when there is only a cellphone connection if you have the data plan to support such functions. This is especially useful for teams that are often separated by travel or who work odd shifts and are never in the same place together.
The three major players in the smart phone business are Android, Apple's iPhone OS, and the Blackberry OS. Each has its ups and downs, but all offer hundreds of calendar sharing solutions. For more information on which of these platforms is the best option for your business or what the best apps for each platform are check out these great articles:
Top 5 Calender Applications for the Android
Best Calender Apps for the Blackberry
Best Calender Apps for the iPhone
(Photo Credit: Abul Hussain of Flickr.com under CC by 2.0 license)