Whether you will have a virtual law office or your own office, you may not want to only use your cell phone to conduct business. Other options exist though:
VOIP Telephones that can operate anywhere you plug them into an internet connection
Call forwarding services like Google Voice
Whether you opt to go paperless or not, with efiling and eservice required in Florida, you will need a method to convert documents into electronic formats for use with other attorneys and the court system.