Motorola Photon 4G has a pixel density of:
256.15

A.K.A. Motorola Photon, MB855
Released: 2011

Resolution: 540×960 4.3″ display

Totaling 0.52mp (megapixels) and having a PPI of 256.15

Category: Phone
Tags: motorola, photon, 4g, 3g, sprint, android, phone, smartphone

Motorola Photon 4G

The Motorola Photon 4G at rest
Manufacturer	Motorola
Compatible networks	WiMAX 2.5 GHz, CDMA 800/1900 MHz (EV-DO Rev. A), GSM 850/900/1800/1900 MHz, UMTS/WCDMA 850/1900/2100 MHz (HSPA+ at 14.4 Mbit/s)
First released	US: July 31, 2011
Availability by region	US: Q3-2011
Successor	Motorola Photon Q
Related	Motorola Atrix 4G Motorola Photon Q
Form factor	Touchscreen smartphone
Dimensions	126.9 mm (5.00 in) H 66.9 mm (2.63 in) W 12.2 mm (0.48 in) D
Mass	158 grams (5.6 oz)
Operating system	Android 2.3.5 Gingerbread
CPU	NVIDIA Tegra 2 dual-core 1 GHz (Cortex-A9 dual-core)
GPU	GeForce ULP
Memory	1 GB LP DDR2 RAM
Storage	16 GB on board, supports up to 32 GB microSDHC, total 48 GB
Battery	1700 mAh Talk time WCDMA = 9.1 hrs GSM = 10.4 hrs Standby time WCDMA = 13.1 days GSM = 12.2 days[1]
Display	4.3-inch 960×540 px qHD TFT LCD at 275 ppi, 16 M colors, Gorilla Glass
Rear camera	8 MP AF, digital zoom with LED Flash Capture – 720p MPEG4 and H.264 at 30 frame/s (full 1080p may be supported via software upgrade post-launch)
Front camera	VGA imager for video chat, self image capture
Connectivity	audio jack 3.5 mm, Micro USB 2.0 HS, corporate sync, BOTA, Wi-Fi 2.4 GHz, 5 GHz 802.11 b/g/n, Bluetooth 2.1 EDR, Micro-HDMI
Data inputs	Multi-touch capacitive touchscreen display, accelerometer, magnetometer, ambient light sensor, proximity sensor, fingerprint reader
Other	Android WebKit with Adobe Flash Player, Mozilla Firefox 4.0.1 in Motorola Webtop mode, eCompass, aGPS with Google Maps, Google Street View, Google Latitude, Android Market
Hearing aid compatibility	M4/T4[2]
Website	[1]

This righthand infobox courtesy of Wikipedia.