Apple Watch Series 7 vs Apple Watch Series 3

Phones Images
PHONES
Phone Names Apple Watch Series 7 Apple Watch Series 3
Network
2G bandsGSM 850 / 900 / 1800 / 1900GSM 850 / 900 / 1800 / 1900
3G bandsHSDPA 850 / 900 / 1700(AWS) / 1900 / 2100 - InternationalHSDPA 850 / 900 / 2100 / 800 - Europe, Australia (A1891)
4G bands1, 2, 3, 4, 5, 7, 8, 18, 19, 20, 25, 26, 28, 39, 40, 41, 66 - International1, 3, 5, 7, 8, 18, 19, 20, 26 - Europe, Australia (A1891)
SpeedHSPA, LTEHSPA, LTE
TechnologyGSM / HSPA / LTEGSM / HSPA / LTE
 1, 2, 3, 4, 5, 7, 12, 13, 14, 17, 18, 19, 25, 26, 39, 40, 41, 66 - USA, LATAM, Canada1, 3, 39, 40, 41 - China (A1892)
Launch
Announced2021, September 142017, September. Released 2017, September
StatusAvailable. Released 2021, October 15Discontinued
Body
BuildSapphire crystal front, ceramic/sapphire crystal back, stainless steel frameGlass front (Sapphire crystal), ceramic/sapphire crystal back, stainless steel frame
Dimensions45 x 38 x 10.7 mm (1.77 x 1.50 x 0.42 in)42.5 x 36.4 x 11.4 mm (1.67 x 1.43 x 0.45 in)
SIMeSIMeSIM
Weight42.3 g (41mm), 51.5 g (45mm) (1.48 oz)52.8 g (1.87 oz)
 IP6X certified 50m water resistant ECG certified (region dependent SW application; HW available on all models)50m water resistant
Display
ProtectionSapphire crystal glassSapphire crystal glass
Resolution484 x 396 pixels (~326 ppi density)390 x 312 pixels (~303 ppi density)
Size1.9 inches1.65 inches
TypeRetina LTPO OLED, 1000 nits (peak)Retina OLED, 1000 nits (peak)
 Always-on display3D Touch display
Platform
CPUDual-coreDual-core
ChipsetApple S7Apple S3
GPUPowerVRPowerVR
OSwatchOS 8.0, upgradable to watchOS 26.1watchOS 4.0, upgradable to watchOS 8.7
Memory
Card slotNoNo
Internal32GB 1GB RAM16GB 768MB RAM
Sound
3.5mm jack NoNo
35mm jackNoNo
Loudspeaker YesYes
Comms
Bluetooth5.0, A2DP, LE4.2, A2DP, LE
NFCYesYes
PositioningGPS, GLONASS, GALILEO, QZSS, BDSGPS, GLONASS
RadioNoNo
USBNoNo
WLANWi-Fi 802.11 b/g/n, dual-bandWi-Fi 802.11 b/g/n
Features
SensorsAccelerometer, gyro, heart rate, barometer, always-on altimeter, compass, SpO2, VO2maxAccelerometer, gyro, heart rate, barometer
 Natural language commands and dictation (talking mode) Ultra Wideband (UWB) supportNatural language commands and dictation (talking mode)
Battery
ChargingWireless, 0-80% in 45 minWireless
TypeLi-Ion 309 mAh (1.19 Wh)Li-Ion 341 mAh (1.34 Wh), non-removable
Misc
ColorsGraphite, Gold, SilverSpace Black, Silver
ModelsA2475, A2476, A2477, A2478, watch6,8, watch6,9A1860, A1861, A1889, A1891, A1890, A1892
PriceAbout 310 EURAbout 700 EUR
SAR1.10 W/kg (head)0.35 W/kg (head)     0.18 W/kg (body)
SAR EU0.70 W/kg (head)     1.50 W/kg (body)-
Camera
 NoNo