A Texas company, Bluebonnet Telecommunications, is suing Apple for patent infringement in relation to call forwarding technology. Specifically Bluebonnet says that the iPhone 4S and 5 violate US Patent No. 5,485,511, a patent that previously belonged to Siemens Rolm Communications but was picked up by Bluebonnet in June 1996. The patent describes a phone communicating with a central switch to generate a list of options, which are then displayed for the phone's user.
