Screen size
iPhone 3GWinner: 3.5"+43%
Watch Ultra 32.0"
Quick verdict
Watch Ultra 3 leads the measured specs 9-5.
Measured wins
iPhone 3G
5
spec wins
Ties
1
equal specs
Watch Ultra 3
9
spec wins
Overall winner
Screen size
Technology
iPhone 3G
GSM / HSPA
Watch Ultra 3
GSM / HSPA / LTE / 5G
2G bands
iPhone 3G
GSM 850 / 900 / 1800 / 1900
Watch Ultra 3
GSM 850 / 900 / 1800 / 1900
3G bands
iPhone 3G
HSDPA 850 / 1900 / 2100
Watch Ultra 3
HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100 - International, China, HK, HSDPA 850 / 1700(AWS) / 1900 / 2100 - USA, LATAM, Canada
Speed
iPhone 3G
HSPA
Resolution
Refresh rate
Peak brightness
Pixel density
CPU speed
RAM
Storage
Main camera
Front camera
Battery
Wired charging
Weight
Thickness
IP rating
Wi‑Fi
Bluetooth
USB
5G support
NFC
3.5mm jack
SD card
equal specsStereo speakers
Watch Ultra 3
HSPA, LTE, 5G
4G bands
iPhone 3G
-
Watch Ultra 3
1, 2, 3, 4, 5, 6, 7, 8, 18, 19, 20, 25, 26, 28, 39, 40, 41, 66 - International, China, HK, 1, 2, 3, 4, 5, 6, 7, 12, 13, 14, 17, 18, 19, 25, 26, 39, 40, 41, 66 - USA, LATAM, Canada
5G bands
iPhone 3G
-
Watch Ultra 3
SA/NSA
Announced
iPhone 3G
2008, June. Released 2008, July
Watch Ultra 3
2025, September 09
Status
iPhone 3G
Discontinued
Watch Ultra 3
Available. Released 2025, September 19
Dimensions
iPhone 3G
115.5 x 62.1 x 12.3 mm (4.55 x 2.44 x 0.48 in)
Watch Ultra 3
49 x 44 x 12 mm (1.93 x 1.73 x 0.47 in)
Weight
iPhone 3G
133 g (4.69 oz)
Watch Ultra 3
61.6 g or 61.8 g (black) (2.15 oz)
SIM
iPhone 3G
Mini-SIM
Watch Ultra 3
eSIM
Build
iPhone 3G
-
Watch Ultra 3
Sapphire crystal front, ceramic/sapphire crystal back, titanium frame (grade 5)
Other
iPhone 3G
-
Watch Ultra 3
IP6X certified 100m water resistant (22810:2010) 40m swimproof/diving (EN13319) MIL-STD-810H compliant ECG certified (region dependent SW application; HW available on all models)
Type
iPhone 3G
TFT
Watch Ultra 3
Retina LTPO3 OLED, 3000 nits (peak)
Size
iPhone 3G
3.5 inches, 36.5 cm2 (~50.9% screen-to-body ratio)
Watch Ultra 3
1.98 inches
Resolution
iPhone 3G
320 x 480 pixels, 3:2 ratio (~165 ppi density)
Watch Ultra 3
514 x 422 pixels (~326 ppi density)
Protection
iPhone 3G
Corning Gorilla Glass, oleophobic coating
Watch Ultra 3
Sapphire crystal glass
Other
iPhone 3G
-
Watch Ultra 3
Wide-angle OLED
OS
iPhone 3G
iOS, upgradable to iOS 4.2.1
Watch Ultra 3
watchOS 26, upgradable to watchOS 26.2.1
CPU
iPhone 3G
412 MHz ARM 11
Watch Ultra 3
Dual-core
GPU
iPhone 3G
PowerVR MBX
Watch Ultra 3
PowerVR
Chipset
iPhone 3G
-
Watch Ultra 3
Apple S10
Card slot
iPhone 3G
No
Watch Ultra 3
No
Internal
iPhone 3G
8GB 128MB RAM, 16GB 128MB RAM
Watch Ultra 3
64GB
Single
iPhone 3G
2 MP
Watch Ultra 3
-
Video
iPhone 3G
No
Watch Ultra 3
-
Other
iPhone 3G
No
Watch Ultra 3
-
Loudspeaker
iPhone 3G
Yes
Watch Ultra 3
Yes, with dual speakers (86-decibel)
Alert types
iPhone 3G
Vibration, proprietary ringtones
Watch Ultra 3
-
3.5mm jack
iPhone 3G
Yes
Watch Ultra 3
No
WLAN
iPhone 3G
Wi-Fi 802.11b/g
Watch Ultra 3
Wi-Fi 802.11 b/g/n, dual-band
Bluetooth
iPhone 3G
2.0, A2DP (headset support only)
Watch Ultra 3
5.3, A2DP, LE
Positioning
iPhone 3G
GPS, A-GPS
Watch Ultra 3
GPS (L1+L5), GLONASS, GALILEO, BDS, QZSS
Radio
iPhone 3G
No
Watch Ultra 3
No
USB
iPhone 3G
2.0
Watch Ultra 3
No
NFC
iPhone 3G
-
Watch Ultra 3
Yes
Sensors
iPhone 3G
Accelerometer, proximity
Watch Ultra 3
Accelerometer, gyro, heart rate, barometer, always-on altimeter (-500m to 9000m), compass, SpO2, VO2max, temperature (body), temperature (water)
Browser
iPhone 3G
HTML (Safari)
Watch Ultra 3
-
Other
iPhone 3G
Audio/video player TV-out Organizer Document viewer Photo viewer Predictive text input
Watch Ultra 3
Temperature sensing (0.01˚ accuracy) Depth gauge (±1m accuracy) Ultra Wideband (UWB) support (gen2 chip) Emergency SOS via satellite
Type
iPhone 3G
Li-Ion 1220 mAh, non-removable
Watch Ultra 3
Li-Ion 599 mAh
Charging
iPhone 3G
-
Watch Ultra 3
Wireless, 0-80% in 45 min
Colors
iPhone 3G
Black(8/16 GB), White (16 GB)
Watch Ultra 3
Natural, Black
Models
iPhone 3G
iPhone1,2
Watch Ultra 3
A3281, A3282
SAR
iPhone 3G
0.52 W/kg (head) 1.29 W/kg (body)
Watch Ultra 3
1.16 W/kg (head)
SAR EU
iPhone 3G
0.56 W/kg (head) 0.23 W/kg (body)
Watch Ultra 3
1.19 W/kg (head)
Price
iPhone 3G
About 90 EUR
Watch Ultra 3
€ 829.00
Other
iPhone 3G
-
Watch Ultra 3
No