• Phone is being sold as spares , it comes on when you plug it in, but only shows the apple logo. For a few minutes then switches off again.nDoes not come on if not plugged in. 
• Phone is not iCloud locked, It started  getting hot, and giving problems , then I restored the operating system using iTunes  and had to iCloud unlock it to do that. But the restore did not help for very long, it started getting hot  again and now it  won't switch on properly, only the apple logo appears for a few minutes.
•  
•  
• iPhone 4
• 16 GB of internal memory.
• 2 cameras , front and rear, skype ability.
• Bluetooth
• Wi Fi
• Cellular
• GPS
• Comes in original box, but without charger ,cable and earphone:

4.5 inches (115.2 mm)

Width:

2.31 inches (58.6 mm)

Depth:

0.37 inch (9.3 mm)

Weight:

4.8 ounces (137 grams)

Cellular and wireless

Location

Power and battery²

• GSM model: UMTS/HSDPA/HSUPA (850, 900, 1900, 2100 MHz); GSM/EDGE (850, 900, 1800, 1900 MHz)
• CDMA model: CDMA EV-DO Rev. A (800, 1900 MHz)
• 802.11b/g/n Wi-Fi (802.11n 2.4GHz only)
• Bluetooth 2.1 + EDR wireless technology
• Assisted GPS
• Digital compass
• Wi-Fi
• Cellular
• Built-in rechargeable lithium-ion battery
• Charging via USB to computer system or power adapter
• Talk time:

  Up to 7 hours on 3G

  Up to 14 hours on 2G (GSM model only)

• Standby time: Up to 300 hours
• Internet use:

  Up to 6 hours on 3G

  Up to 10 hours on Wi-Fi

• Video playback: Up to 10 hours
• Audio playback: Up to 40 hours  

Display

Audio playback

TV and video

• Retina display
• 3.5-inch (diagonal) widescreen Multi-Touch display
• 960-by-640-pixel resolution at 326 ppi
• 800:1 contrast ratio (typical)
• 500 cd/m2 max brightness (typical)
• Fingerprint-resistant oleophobic coating on front and back
• Support for display of multiple languages and characters simultaneously
• Frequency response: 20Hz to 20,000Hz
• Audio formats supported: AAC (8 to 320 Kbps), Protected AAC (from iTunes Store), HE-AAC, MP3 (8 to 320 Kbps), MP3 VBR, Audible (formats 2, 3, 4, Audible Enhanced Audio, AAX, and AAX+), Apple Lossless, AIFF, and WAV
• User-configurable maximum volume limit
• Video formats supported: H.264 video up to 720p, 30 frames per second, Main Profile level 3.1 with AAC-LC audio up to 160 Kbps, 48kHz, stereo audio in .m4v, .mp4, and .mov file formats; MPEG-4 video, up to 2.5 Mbps, 640 by 480 pixels, 30 frames per second, Simple Profile with AAC-LC audio up to 160 Kbps per channel, 48kHz, stereo audio in .m4v, .mp4, and .mov file formats; Motion JPEG (M-JPEG) up to 35 Mbps, 1280 by 720 pixels, 30 frames per second, audio in ulaw, PCM stereo audio in .avi file format
• Support for 1024 by 768 pixels with Dock Connector to VGA Adapter; 576p and 480p with Apple Component AV Cable; 576i and 480i with Apple Composite AV Cable (cables sold separately)

Camera, photos, and video

• Video recording, HD (720p) up to 30 frames per second with audio
• 5-megapixel still camera
• VGA-quality photos and video at up to 30 frames per second with the front camera
• Tap to focus video or still images
• LED flash
• Photo and video geotagging

External buttons and controls

• On/off
• Sleep/wake
• Ring/silent
• Volume up/down
• Home

Sensors

• Three-axis gyro
• Accelerometer
• Proximity sensor
• Ambient light sensor

Connectors and input/output

• 30-pin dock connector
• 3.5-mm stereo headphone minijack
• Built-in speaker
• Microphone