A subscription gives you access to the full capabilities of your dog's Fi Collar - allowing Fi remote access to your dog's location and activity. The subscription price covers the GPS/LTE connection to your dog's Fi collar. See: What's Included in My Fi GPS/LTE Subscription?
Yearly Fi Subscription Pricing
Fi GPS/LTE Subscriptions are prepaid and available in 1, 2 or 3 year plans. Every subscription includes a free 30-day trial. This means you won't be charged for your plan immediately upon checkout, but instead, 30 days after activating your pup's Fi collar. See: When Will I Be Billed for My Fi GPS/LTE Subscription?