Features Key features of the Lumia 520  vs RAZR D3 

screen size

Swiping around the various screens is smooth and responsive, while the 4-inch display is plenty big enough to do most things comfortably.
Lumia 520 | by TechRadar (Apr, 2014)

screen resolution

Lumia 520
800 x 480
RAZR D3
854 x 480
In automatic mode the phone performed pretty good, with accurate color representation and enough detail in the photos.
Lumia 520 | by PhoneArena (Apr, 2013)

memory

Lumia 520
0.5 GB
RAZR D3
1 GB

processor

Lumia 520
Dual core
RAZR D3
Dual core
Coming in a variety of jolly colors, it hits the sweet spot of price and productivity, employing a decent display, dual-core processor and a 5MP camera, all at rock bottom pricing.
Lumia 520 | by PhoneArena (Apr, 2013)

camera resolution

Lumia 520
5 MP
RAZR D3
8 MP
The 5 megapixel camera is good for the price and while it doesn't have much built in storage it has a micro SD card slot to make up for it.
Lumia 520 | by TechRadar (Apr, 2014)

Differences What are the advantages of each

Front view of Nokia Lumia 520

Reasons to consider the
Nokia Lumia 520

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Records higher def video 1280 x 720 @ 30 fps vs 1280 x 720 @ Unknown 30x higher def video
Better theoretical download speed 21.1 Mb/s vs 7.2 Mb/s Around 3x better theoretical download speed; enjoy lightning fast downloads on modern networks
Back view of Motorola RAZR D3

Reasons to consider the
Motorola RAZR D3

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Much bigger app store 850,000 apps vs 120,000 apps More than 7x more apps; find an app for virtually any task
Supports NFC Yes vs No Somewhat common; Enables payment by phone and other wireless communications
More battery capacity 2,000 mA·h vs 1,430 mA·h Around 40% more battery capacity
Higher resolution front camera 8 MP vs 5 MP 60% higher resolution front camera; Video chat with other people
Faster processor 1.2 GHz vs 1 GHz Around 20% faster processor; run computation-intensive applications, such as photo editing, faster

Specifications Full list of technical specs

screen

Lumia 520  vs
RAZR D3 
Type Super IPS LCD2 Super IPS LCD2
Size 4" 4"
Resolution 800 x 480 854 x 480
Touchscreen Capacitive Capacitive
Multitouch Yes Yes
PPI 233 ppi 244 ppi

sensors

Has an assisted GPS Yes Yes

music

Supports FM radio Yes Yes

software

Operating system Windows Phone 8 Android 4.1
App store Windows Phone Marketplace Android Market
Adobe flash support No No
App store size 120,000 apps 850,000 apps

connectivity

Acts as a wi-fi hotspot Yes Yes
Supports NFC No Yes
Bluetooth Bluetooth v4.0 Bluetooth v4.0

form factor

Lumia 520  vs
RAZR D3 
Weight 124 g 120 g
Thickness 9.9 mm 9.8 mm
Size 64 x 119.9 x 9.9 mm 59.8 x 119.3 x 9.8 mm

hardware

Clock speed 1 GHz 1.2 GHz
Number of cores Dual core Dual core
RAM 0.5 GB 1 GB
Internal storage 8 GB 4 GB
Supported card formats
SDXC
SDHC
SD

photo & video

Camera 5 MP 8 MP
Resolution 5 MP 8 MP
Video resolution 1280 x 720 @ 30 fps 1280 x 720 @ Unknown

cellular

Generation 3.5G 3.5G
Networks
GPRS (0.01 Mb/s)
HSUPA (5.76 Mb/s)
UMTS (0.38 Mb/s)
EDGE (0.38 Mb/s)
Unknown (7.2 Mb/s)
HSDPA (21.1 Mb/s)
GSM (0.01 Mb/s)

battery

Capacity 1,430 mA·h 2,000 mA·h
Nokia Lumia 520
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Motorola RAZR D3
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