Apple iPhone 3GS has a pixel density of:
164.83

A.K.A. 3GS
Released: 2009

Resolution: 320×480 3.5″ display

Totaling 0.15mp (megapixels) and having a PPI of 164.83

Category: Phone
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iPhone 3GS

Black iPhone 3GS
Developer	Apple Inc.
Manufacturer	Foxconn (contract manufacturer)[1]
Slogan	“The fastest, smartest phone yet.” (2009–2010) “More to love. Less to pay.” (2010–2012)[2]
Generation	3rd
Model	A1325 (China) A1303[3]
Compatible networks	Quad-band GSM/GPRS/EDGE (850, 900, 1800, 1900 MHz) Tri-band UMTS/HSDPA (850, 1900, 2100 MHz)
First released	June 19, 2009; 10 years ago (2009-06-19) [4]
Discontinued	June 24, 2010; 9 years ago (June 24, 2010) (16, 32GB) September 12, 2012; 7 years ago (September 12, 2012) (8GB)
Predecessor	iPhone 3G
Successor	iPhone 4
Related	iPod Touch (3rd generation)
Type	Smartphone
Form factor	Slate
Dimensions	115.5 mm (4.55 in) H 62.1 mm (2.44 in) W 12.3 mm (0.48 in) D
Mass	135 g (4.8 oz)
Operating system	Original: iPhone OS 3.0 Last: iOS 6.1.6, released February 21, 2014 (2014-02-21)
System on chip	Samsung S5PC100
CPU	600 MHz ARM Cortex-A8[5]
GPU	PowerVR SGX535
Memory	256 MB DRAM
Storage	8, 16 or 32 GB flash memory
Battery	Built-in rechargeable lithium-ion battery 3.7 V 1220 mAh
Data inputs	Multi-Touch touchscreen display 3-axis accelerometer Digital compass Proximity sensor Ambient light sensor Microphone Headset controls
Display	3.5 in (89 mm) diagonal 2:3 aspect ratio screen 24-bit (16.76 million colors) LCD 480×320 pixel resolution at 163 ppi
Rear camera	3 MPix with video (VGA at 30 fps) Photo and video geotagging Tap to focus video or still images Exposure
Sound	Single loudspeaker 3.5 mm TRRS, 20 Hz to 20 kHz frequency response (internal, headset) Microphone
Connectivity	Wi-Fi (802.11 b/g) Bluetooth 2.1+EDR Dock connector[6]
SAR	Head: 1.19 W/kg Body: 0.67 W/kg[7]
Website	Apple – iPhone – Mobile phone, iPod, and Internet device. at the Wayback Machine (archived June 25, 2009)

This righthand infobox courtesy of Wikipedia.