24. "I looked on the FiOS website..." In response to In response to 16
I looked on the FiOS website and read their description of the 50/50 plan. But I didn't read anything about a 3 device limit.
Unless you were using their router, I don't know how they could limit the number of devices in your home network. My sense, without looking at the marketing, is that unless you were using a 'static IP address' (a dedicated line to the Internet and something most people don't need), the device restriction sounds odd. Like a number the company would list in order to offer the suggested number of devices to be used and not a definitive number.
For the record, I'm not in networking. I do have some experience setting up home networks though and doing some basic troubleshooting.