I previously owned the 3G Commando; I just "upgraded" to the C811 4G LTE. It will not sync with my pickup truck. My truck is a Ford F250; my old phone worked fine. At the Verizon dealership, we flawlessly linked a Motorola and a Windows 8 phone in my pickup. We then tried my new phone in in the Radio Shack dealer's F150 (with Sync) and had the same disappointing result.
It appears there is a flaw in the software that will not allow the Casio C811 4G LTE to link with the Ford Sync program. The dealer and I called Casio, but received no assistance.
I like the phone. I farm and ranch for a business, so durability of the phone is foremost. I am also on the Board of Directors of three different organizations, so my pickup is my office during the daytime hours. I really need the phone to sync with my system.