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Backgammon s3 and s7 and Gionee gn 106 are cost-effective. My student. Which one to buy?
Hello, S7 is cost-effective, and the parameters are as follows:

Mobile phone function:

Support frequency band 2g: GSM 850/900/1800/1900 MHz; 3G:WCDMA2 100

Network connection support: 3G network HSDPA 7.2 Mbps;; ; GPRS/2G network edge

Operating system: Android OS 4.0.4 ram: 512mb rom: 4g CPU frequency:1g.

Optional color: Swiss white (other colors to be determined)

Size:/kloc-0 123X64X9.9mm (standard height) Weight: 142g (with battery)

Single screen: 4.0-inch capacitive touch screen, 4.0-inch display WVGA, 480×800.

Battery: BK-B-42 capacity: 1500 mah.

Standby/talk time (depending on network quality)

Talk time: GSM≤8 hours, WCDMA≤6 hours.

Standby time: GSM≤450 hours, WCDMA≤330 hours

MP3 playback time: external playback: ≤7.5 hours; Headphones: ≤30 hours.

Main camera: 500W pixel sub-camera: 200W pixel TF card: can support 32G at most.

Built-in third-party software: social communication (QQ20 1 1, Sina Weibo, Renren, WeChat), life communication (public comment, Taobao software, worry-free future, I will check where to travel), game communication (Fruit Ninja, fishing up), movie communication (Youku, Sohu video), reading communication (ViVa).

Functions: dual card dual standby, HS USB 2.0, support for Wi-Fi/WAPI, GPS and AGPS, automatic screen locking (diversified unlocking methods), pattern lock, time switch, scene desktop, online wallpaper download, intelligent voice input, color impression pendant, SIM card lock, menu upgrade, account management, compass (electronic compass application), Baidu search, SMS encryption, SMS. Bluetooth (2. 1), application of gravity acceleration sensor, light sensing control, application of infrared proximity sensor, security assistant (including SMS firewall and incoming call firewall-unlimited number), synchronization assistant, power-saving mode (including instructions on power-saving skills), program management, traffic monitoring, flashlight, dictionary, incoming call head portrait, theme change, and wallpaper of holiday lock changing machine (similar to holiday wallpaper).

Main chips: mt 6575+mt 6162+RF 3233+RF 7241+RF 7248+mt 6620+MCP H9Dp32a4JJacgr+YDA145+HSC dtd004a (electronic compass).