Back when Google announced the Nexus 5X and the Nexus 6P devices, they also announced an insurance plan that would be available for the twp new devices called Nexus Protect. That service became officially available for Project Fi subscribers as of December 17th 2015, which was just last week, allowing users who purchased these devices through Fi to ensure that they're devices are protected. Google offers a single option of the Nexus Protect plan to consumers, which includes an extended year of warranty past the initial manufacturers warranty and accidental damage protection for two years, in which they'll send you out a new device for a deductible cost.
With Nexus Protect now available to Project Fi users, some subscribers are finding out that Google is backdating charges for the monthly fee that Nexus Protect costs on top of their bill payments each month, which is $5 per month, totaling $10 for anyone who picked up their devices with Fi at launch. It's understandable for subscribers to be upset about paying for a service which they didn't have on their plan, and in any other case the carrier might bend over backwards to get a mistake fixed that revolves around backdated charges.
In this particular case though, Google had clearly stated and notified Project Fi users that if they choose to enroll in the Nexus Protect plan to be tacked onto their monthly phone bill, that the monthly charge for Nexus Protect would be backdated to cover those extra months of Project Fi service without it. Customers choosing to enroll in this knowing that these charges would be appearing have little to complain about as they were aware of the upcoming fees. Being that the costs are just $5 for each month for Nexus Protect on Project Fi and it's only been a couple of months since Nexus Protect itself has been available, this would have been much more of a shock to customers had the charges been backdated for 6 months to a year as that extra $5 a month could amount to much more than just $10 for two months. If you've yet to pick up a new Nexus device or set up Project Fi but you are considering the change, adding Nexus Protect as a new customers will start you off without any backdated charges.