How to connect Fitbit Ace LTE to iPhone

The Fitbit Ace LTE is the only device in Google's entire wearable lineup built exclusively for children aged 7 and up - with built-in 4G LTE calling, real-time GPS your child can't disable, a parent-controlled contact list, parental screen time controls, and activity-powered games through Fitbit Arcade. It is also one of the very few Google-ecosystem wearables with genuine first-class iPhone support: the parent companion app runs natively on iOS 16 and later, designed that way by Google from the start. For iPhone-using parents who want their child connected but not on a smartphone, the Ace LTE is purpose-built for exactly this. Merge can extend notification routing beyond the native Fitbit experience for cases where that's needed.

What parents can manage from iPhone

The Fitbit parent app on iPhone gives you full control over the Ace LTE experience. You set the approved contact list - up to 20 people aged 13 or older - and your child cannot add or change contacts themselves. Real-time GPS location is always visible in the app; you can check where your child is at any time without notifying them. Screen time limits let you disable games during school hours or set automatic cutoffs at bedtime. Activity data - steps, active minutes, and sleep - syncs to the parent app rather than being displayed to your child as raw numbers, which is an age-appropriate design choice. The Fitbit Arcade game library, where physical movement is the game mechanic, is managed through the Fitbit Ace Pass subscription.

Android activation note

Initial device setup for the Ace LTE requires completing the first-time activation flow with an Android phone. The Fitbit child account creation and watch pairing steps are not available from an iPhone at first setup. Borrowing an Android phone for around 15 minutes covers the activation. After that, the parent app on your iPhone handles all ongoing management - contact lists, GPS, screen time, and activity data - without needing an Android device again.

Pairing Fitbit Ace LTE with your iPhone

Have your iPhone, the Ace LTE, and your child present for setup. Complete the initial activation using an Android phone first, then proceed with the steps below.

1. On your iPhone, search for Merge Watch in the App Store and install it.
2. On the Ace LTE, open its Play Store, search for Merge Watch, and install it.
3. Open Merge on your iPhone - approve the Bluetooth permission when prompted, then keep it foregrounded.
4. On the Fitbit Ace LTE, open Merge and approve the Bluetooth permission when prompted.
5. Tap Start Pairing - the watch stays discoverable for five minutes.
6. On your iPhone, open Settings → Bluetooth and wait for the watch to appear in the list, then tap it to pair.
7. Once paired, your iPhone will appear in Merge on the watch - tap it to complete the connection.
8. Set up your Merge subscription via the iPhone app if prompted.
9. Grant notification permissions on both devices when asked.

The Ace LTE as a daily device for your child

For children in the 7-12 age range, the Ace LTE typically becomes the first device they are genuinely engaged with. The Fitbit Arcade game mechanic - where movement directly powers in-game progress, with no way to advance while sitting still - creates a feedback loop between physical activity and reward that passive step counting does not. The 16+ hour battery covers a full school day with both LTE calling and Arcade gaming running, and Gorilla Glass 3 plus the included protective bumper handle the drops and collisions that are simply part of childhood at this age. The LTE calling is the feature that changes what independence looks like: a child who can call you from the watch - without needing a phone, without needing to find one - can be given more freedom earlier, because you can reach each other whenever it matters.