Apple
Watch Ultra 4
Apple's rugged watch with up to 50 hours of battery, 5G and satellite antennas.
Last checkedWhat it can do
- Can a smartwatch work without your phone nearby?Yes
Apple Watch Ultra 4 supports 5G (RedCap) and LTE, with antennas for cellular and satellite.
Good to know: Data plan required; 5G only in select markets.
- Can you talk to an AI assistant on your smartwatch?Yes
Apple Watch Ultra 4 has Siri powered by Apple Intelligence.
Good to know: Maker's description.
- How long does a smartwatch battery last?Yes
Apple rates Apple Watch Ultra 4 at up to 50 hours of normal use and 84 hours in Low Power Mode; 15 minutes of charging gives up to 18 hours.
Good to know: Maker's figures.
- Which phone does a smartwatch need?Yes
Apple Watch Ultra 4 requires an iPhone 11 or later with iOS 27 or later.
Good to know: Apple lists iPhone models only.
Compare Watch Ultra 4
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How we know (1 source)
Apple Watch Ultra 4 tech specs (read Oct 24, 2026): up to 50 hours of normal use, up to 84 hours in Low Power Mode, up to 18 hours of workout tracking; 15 minutes of charging gives up to 18 hours. Supports 5G (RedCap) and LTE, with cellular/satellite antennas; data plan required. Siri powered by Apple Intelligence. Requires iPhone 11 or later with iOS 27 or later.
Read the source
Status timeline
No status has changed since we started tracking. Every entry is dated and backed by the sources on this page.
- First recorded: In storesCan a smartwatch work without your phone nearby?
Apple Watch Ultra 4 supports 5G (RedCap) and LTE, with antennas for cellular and satellite.
- First recorded: In storesCan you talk to an AI assistant on your smartwatch?
Apple Watch Ultra 4 has Siri powered by Apple Intelligence.
- First recorded: In storesHow long does a smartwatch battery last?
Apple rates Apple Watch Ultra 4 at up to 50 hours of normal use and 84 hours in Low Power Mode; 15 minutes of charging gives up to 18 hours.
- First recorded: In storesWhich phone does a smartwatch need?
Apple Watch Ultra 4 requires an iPhone 11 or later with iOS 27 or later.