Yes. The Fi Series 3+ collar has its own LTE-M cellular connection and GPS, so it tracks your dog whether or not your phone is nearby. You use the Fi app to see location, activity, and alerts on your phone, but the collar itself does not depend on your phone to track.

Fi uses GPS combined with LTE-M cellular and Wi-Fi awareness to pinpoint your dog. Accuracy varies with environment — open sky gives the tightest fix, while dense buildings or heavy tree cover can reduce it — but Fi is designed to give you a close enough location to find your dog quickly if they get out.

Battery life varies based on how often your dog leaves their Wi-Fi base, how much LTE the collar uses, and activity level. Most members get multi-day battery life on a single charge under typical use. Lost Dog Mode increases location frequency and uses more battery.

Yes. Fi requires an active membership for the cellular GPS, app features, and ongoing service. The collar hardware on its own does not provide tracking without a membership.

Fi membership starts at $19/month with options for longer prepaid terms that bring the monthly cost down. See the membership page for current pricing and term options.

Yes. The Fi Series 3+ collar is built to be waterproof for swimming, baths, and rainy walks, and is designed to stand up to dirt, mud, and rough outdoor use.

Fi Series 3+ comes in multiple sizes to fit dogs from small to extra large. You can pick the size based on your dog’s neck circumference; the size chart on the product page lists the exact ranges for each size.

Yes. The Fi app shows your dog’s current location and recent location history. When your dog leaves a designated safe area or you put the collar in Lost Dog Mode, Fi increases location update frequency for live tracking.

Fi sends an alert to your phone the moment your dog leaves a designated safe zone. You can switch to Lost Dog Mode for live location updates and rally a Search Party of nearby Fi users to help find your dog.

No separate setup fee — your costs are the collar hardware and an active Fi membership. Set up is done in the Fi app.

Fi uses LTE-M, a low-power cellular network designed for connected devices. LTE-M offers strong coverage and battery efficiency compared to standard LTE, which helps the collar last days on a single charge.

Fi is built for use in the United States and Canada. Coverage and feature availability outside those regions can vary; check the support site for current details before traveling internationally with the collar.

Yes. You can add multiple dogs to a single Fi account, each with their own collar and membership. The Fi app lets you switch between dogs and see each dog’s activity, location, and stats.

You can manage and cancel your Fi membership from the Fi app or by contacting Fi support. Refund and proration terms depend on the membership plan you chose at checkout.

Yes. The Fi app is available for both iOS and Android. Fi does not require an Apple Watch or any other wearable to work.