Apple iPhone 4 Review - Technology - Cell Phones

At WWDC2010 the long-waited Apple iPhone 4 (16GB and 32GB version), the 4th generation of iPhone, was released this June, together with iPhone 3GS (8GB version), after the success of iPhone and iPhone 3G. Please see Apple iPhone 4 review for more details.1. Apple iPhone 4-Appearance(1) IPhone 4-Keys LayoutIPhone 4 has some changes in layout of SIM card slot, volume keys and dual-microphone. Dual-microphone with noise-suppression function is another improvement in appearance, which greatly improves the speech quality. And the secondary microphone can be used as a receiver for improving sound quality in FaceTime.a. Left: Previous single volume key is divided into 2 individual keys, together with one mute key are on the left body b. Right: The SIM card slot is moved to the right side of iPhone.c. Top: A 3.5mm stereo headphone mini-jack, a mini microphone and a sleep-wake key are present in order on the top. d. Bottom: There is a speaker-like microphone, a 30-pin dock connecto r, and a built-in speaker on the bottom.(2) IPhone 4-Retina DisplayThe greatest improvement of apple iPhone 4 is the 3.5" wide screen with latest Retina display offering an ultra-clear 960x 640 screen resolution and 800:1 contrast ratio. The latest Retina display with 326 pixels per inch quadruples the panel density for wide viewing angle and superb color, so whites are brighter, blacks are darker, and the image in web page, games and movies will be more brilliant. Besides, Retina display is power-saving. The built-in ambient light sensor and LED backlighting will adjust automatically the brightness of the screen to save power.(3) IPhone 4-Durable Tempered Glass & Seamless SurfaceThe apple iPhone 4 gives us an elegant and sturdier feeling compared to its predecessor, owing to seamless surface without a gap to collect dirt & dust and smooth piano finish in the front and rear of iPhone 4. The sturdier felling comes from the scratch-resistant and durable tempered glass often us ed in helicopter or high-speed trains.(4) IPhone 4-AntennaThe other studier felling of Apple iPhone 4 derive from the stainless steel band surrounding the side. To our surprise, actually the antennas is integrated with the stainless steel band, the left border for Bluetooth, Wi-Fi and GPS, the right side for UMTS and GSM, instead of being hidden inside the body. (5) Ultra-thin BodyThis distinguished room-saving design of Antenna makes iPhone 4 an ultra-thin phone. With the thickness of 9.3mm, iPhone 4 looks like an elegant matchbox, which is 24% thinner than iPhone 3GS (12.3mm).2. Apple IPhone 4-Features(1) IPhone 4-Hardwarea. Processor & MemoryApple iPhone 4 sports 1GHz Apple A4 processor, which is power-saving, and larger built-in memory (up to 512MB) than iPhone 3GS and iPad. The upgrade of hardware ensures the better performance. b. Battery CapacityThe upgrade of iPhone 4 hardware brings better battery capacity, which allows up to 300h standby time, 7 h (3G)/ 14 h (2G) t alk time, 6 h (3G)/ 10 h (Wi-Fi), Up to 10 h Video playback, 40 h Audio playback.(2) IPhone 4-Three-axis GyroThe new three-axis gyro and accelerometer of Apple iPhone 4 provide 6-axis motion sensing, making operating experience close to reality. The new three-axis gyro can be widely used in many ways, such as testing slope and displacement distance.(3) IPhone 4-5MP Camera + LED flash+ Front VGA CameraBesides the 5MP rear-camera supporting 720P HD video recording (1280720), iPhone 4 brings in front-facing camera for video chatting in FaceTime and LED flash for better capturing effect.(4) IPhone 4-Support Micro SIM Card OnlyFor saving room for battery, iPhone 4 only support specialized Micro SIM instead of standard SIM card, which will be inconvenient for most users.(5) IPhone 4-FaceTime Video CallingYou can enjoy a high quality FaceTime video calling by clicking the FaceTime icon with Wi-Fi connectivity on condition that the calling and called party are iPhone 4 users. By the way, the limitation of WiFi connectivity in FaceTime video calling is temporary, and we estimated iPhone 4 users can use FaceTime function via 3G in 2011.Furthermore, Apple Company hoped that FaceTime technology, allowing multiple open standards, such as H.264, AAC, SIP, STUN, TURN, ICE, RTP, SRTP, would be industry standards in the future.(6) IPhone 4-ConnectivityIPhone 4 offers 3.5mm headset jack, 802.11b/g/n Wi-Fi, GPS navigation, digital compass and Bluetooth 2.1+EDR. Besides, iPhone 4 supports UMTS/HSDPA/HSUPA (3G) and GSM/EDGE (2G) network3. Apple iPhone-Summary:Comparing to the previous iPhone 3GS, Apple iPhone 4 has so many upgrades in performance and appearance, which will bring you pleasing experience and surprise.(1) Pros9.3mm ultra-slim bodyRetina display with high resolutionScratch-resistant and durable tempered glass5MP camera with 720P HD video recordingFaceTime video calling via WiFi connectivity Three-axis Gyro+ accelerometerPower-saving and high-speed 1GHz ARM Cortex-A8 processor 512MB built-in memory(2) Cons Controversial antenna problemSupport specialized Micro-SIM card Only4. Apple iPhone 4-Specification3G Network: HSUPA (850, 900, 1900, 2100 MHz)2G Network: GSM (850, 900, 1800, 1900 MHz)Size: 115.258.69.3mm, 137gDisplay: 3.5-inch widescreen Multi-Touch Retina display (640x960 pixel resolution at 326 ppi, contrast ratio: 800:1, 500cd/ brightness), scratch-resistant surface, multi-touch input method,Sensor: Three-axis gyro+ accelerometer provide 6-axis motion sensing, proximity sensor, ambient light sensorConnectivity: GPS, 802.11b/g/n Wi-Fi (802.11n 2.4GHz only), Bluetooth 2.1 + EDR wireless technology, 3.5mm headset jackOther Features: Facetime, GPSMemory: Built-in 512MB and 16GB or 32GB versions availableCamera: 5MP autofocus camera (2592x1944 pixels) with LED flash (Video recording, 720p HD up to 30 frames per second with audio) and a secondary VGA front camera, geo-taggingOS: iOS 4Processor: 1GHz Apple A4 processorBatt ery: Rechargeable lithium-ion, Talk time: up to 7 hours on 3G/ up to 14 hours on 2G, standby time: up to 300 hoursInternet use: up to 6 hours on 3G/ up to 10 hours on Wi-FiVideo playback: up to 10 hoursAudio playback: up to 40 hours

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