The Fi Series 3+ takes everything you love about the Series 3 and levels it up. With smarter technology, deeper health insights, and more ways to stay connected, the Series 3+ is built for dog parents who want the most advanced device we’ve ever made.
Click the Series 3+ banner in your Fi App to begin your upgrade. Need help? Start a chat with us here!
What Makes Series 3+ Next-Level?
Faster, Smarter Tracking: Equipped with an enhanced antenna, the Series 3+ delivers 2x faster and more accurate GPS Tracking. This means quicker updates when your dog is on the move - whether you’re exploring new trails or responding to an unexpected escape.
Apple Watch Compatibility: Stay synced without skipping a beat. The Fi Apple Watch App puts key location and activity data right on your wrist, offering seamless access to your Fi Profile from anywhere.
AI-Powered Behavior Tracking: Series 3+ is the first device to detect steps, sleep, barking, licking, scratching, eating, and drinking - unlocking a comprehensive view of your dog’s wellness and daily routines. Spot trends earlier, and understand your dog like never before.
AI-Organized Vet Records: Upload your dog’s health documents directly in the Fi App. Our AI Vet Records feature organizes and summarizes them, keeping everything accessible for appointments, emergencies, and peace of mind.
International Support: Thanks to upgraded roaming capabilities included in your Fi Membership, your Fi Device will seamlessly connect to the AT&T LTE-M network when traveling across the United States, Canada, and Mexico.
Series 3 Vs. Series 3+ Feature Comparison
| Features | Series 3 | Series 3+ |
GPS Tracking |
✅ |
2x improved GPS tracking |
Lost Dog Mode |
Location updates in real-time |
Location updates in real-time |
Health Tab Access |
Activity + Rest |
Activity + Rest |
Behavior Tracking (AI) |
🚫 |
Eating, Drinking, Barking, Licking, and Scratching |
Apple Watch Integration |
🚫 |
✅ |
Battery Life |
3 Months |
3 Months |
Waterproof |
✅ |
✅ |
Extended Warranty |
✅ |
✅ |
Frequently Asked Questions
Do you have an upgrade offer for current Fi Members?
Yes, we do!
For Series 3 Members: Pay $79 to upgrade to the Series 3+ —available to all Series 3 members, regardless of membership. The cost is for the Series 3+ Device only, and will not affect your current membership. Your Series 3 Band and Base are compatible with the Series 3+ Device.
For Series 1 or 2 Members: Upgrade to the Series 3+ by purchasing a 1 Year Membership for $99. The price includes the Series 3+ Device, Collar Band, and a Base.
Can I use my current Series 3 accessories with the Series 3+?
Yes. All current Series 3 accessories - including Charging Bases and Collar Bands - are fully compatible with Series 3+.
Do I need a new membership to upgrade?
You do not need a new membership if you're upgrading from Series 3. Your existing membership will continue uninterrupted.
If you're upgrading from Series 1 or Series 2, you’ll start a new 1 Year Membership upon activation.
Why upgrade from Series 2 or 3 to a Series 3+?
Series 3+ offers more precise GPS and unlocks AI features.