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 tracker 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 tracker 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 tracker 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 |
Yes |
2x improved GPS tracking |
Lost Mode |
Location updates in real-time |
Location updates in real-time |
Health Tab Access |
Activity + Rest |
Activity + Rest |
Behavior Tracking (AI) |
No |
Eating, Drinking, Barking, Licking, and Scratching |
Apple Watch Integration |
No |
Yes |
Battery Life |
3 Months |
3 Months |
Waterproof |
Rated both IP68 and IP66K |
Rated both IP68 and IP66K |
Frequently Asked Questions
Do you have an upgrade offer for current Fi Members?
Yes, we do have an upgrade offer for you to take advantage of. Your offer details depend on which Series tracker you have. You can find steps on how to upgrade to the Series 3+ directly in the Fi App in the Fi Series Upgrade Program article.
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.