Hello - How do I check my data usage on my FIOS internet plan?
There may be a third party software you can install on your PC, but I do not believe there is a Verizon supported way of doing that. Is there a reason for this? Verizon FiOS has no limits.
No known way to check. You can "guesstimate" based on some of the counters indicated in the router's Statistics pages but by no means will it be accurate. Your best bet is a 3rd party router or firmware with built-in metering.
Best thing to do though would be to not worry about data usage. FiOS is unmetered and rightfully so.