Apple Watch SE 3 vs Apple Watch Series 12
4 questions both answer, side by side. Every answer is backed by the dated sources at the bottom.
Side by side
Can a smartwatch work without your phone nearby?
GPS + Cellular models of Apple Watch SE 3 support 5G (RedCap) and LTE.
Good to know: Data plan required; cellular models only.
GPS + Cellular models of Apple Watch Series 12 support 5G (RedCap) and LTE.
Good to know: Needs a carrier plan; costs vary.
Can you talk to an AI assistant on your smartwatch?
Apple Watch SE 3 has Siri powered by Apple Intelligence.
Good to know: Maker's description.
Apple Watch Series 12 has Siri powered by Apple Intelligence.
Good to know: Maker's description.
How long does a smartwatch battery last?
Apple rates Apple Watch SE 3 at up to 18 hours of normal use and 32 hours in Low Power Mode.
Good to know: Maker's figures.
Apple rates Series 12 at up to 24 hours of normal use and 38 hours in Low Power Mode; 15 minutes of charging gives up to 12 hours.
Good to know: Maker's figures.
Which phone does a smartwatch need?
Apple Watch SE 3 requires an iPhone 11 or later with iOS 27 or later.
Good to know: Apple lists iPhone models only.
Apple Watch Series 12 works with an iPhone; Apple lists iPhone 11 or later on iOS 26 for its watchOS 26 features.
Good to know: Apple's requirement is a footnote on its watchOS 26 features.
How we know (2 sources)
Apple Watch SE 3 tech specs (read Oct 24, 2026): up to 18 hours of normal use, up to 32 hours in Low Power Mode; 15 minutes of charging gives up to 8 hours. GPS + Cellular models support 5G (RedCap) and LTE; data plan required. Siri powered by Apple Intelligence. Requires iPhone 11 or later with iOS 27 or later.
Read the sourceApple Watch Series 12 tech specs (read Oct 23, 2026): up to 24 hours of normal use, up to 38 hours in Low Power Mode, up to 10 hours of workout tracking; 15 minutes of charging gives up to 12 hours. GPS + Cellular models support 5G (RedCap) and LTE. Siri powered by Apple Intelligence. Apple's notes list iPhone 11 or later on iOS 26 for its watchOS 26 features.
Read the source