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Phone Samsung SGH-X640 Samsung SCH-U740 Alias ZTE Blade Max 3 / Max Blue BlackBerry 7750 TCL 40 XL / Jitterbug Smart 4
Current U.S. Carriers (none) (none) (none) (none) (none)
Global Availability Released Released Released Released Released
Specifications 
Display Size ? ? 6" diag.
16 : 9
? 6.8" diag.
20 : 9
Display Resolution & Type 128 x 160 pixels
LCD (TFT/TFD)
176 x 220 pixels
LCD (TFT/TFD)
1080 x 1920 pixels
(~367 ppi)
LCD (TFT/TFD)
240 x 240 pixels
LCD (Color)
720 x 1600 pixels
(~260 ppi)
LCD (TFT/TFD)
Display Refresh ? ? 60 Hz ? 90 Hz
Battery 800 mAh ? 4,000 mAh ? 5,000 mAh
Processor ? ? 2 GHz Qualcomm Snapdragon 625 (MSM8953) ? 2.3 GHz MediaTek Helio G37
RAM ? ? 2 GB ? 4 GB
Storage ? raw hardware ? raw hardware 16 GB ? raw hardware 128 GB
Main Camera Yes 1 megapixel 13 megapixel - 50 megapixel
Wide Camera - - - - -
Tele Camera - - - - -
Video Capture - ? 4K UHD - 1080p HD
Front Camera - - 5 megapixel - 8 megapixel
Weight 3 oz
(85g)
3.56 oz
(101g)
6.34 oz
(180g)
5.01 oz
(142g)
6.88 oz
(195g)
Dimensions 3.43" x 1.81" x 0.91"
(87 x 46 x 23.1 mm)
3.84" x 2.04" x 0.63"
(98 x 52 x 16 mm)
6.49" x 3.3" x 0.35"
(165 x 84 x 8.9 mm)
4.76" x 3.03" x 0.71"
(121 x 77 x 18 mm)
6.61" x 3.01" x 0.35"
(168 x 76 x 8.8 mm)
Form Factor Clamshell Clamshell Slab Slab Slab
Platform / OS (proprietary) (proprietary) Android BlackBerry OS Android
Network Bands

GSM: 900, 1800, 1900

CDMA: 850, 1900

4G LTE: 2, 4, 5, 12, 13, 25

WCDMA: 2, 4, 5

CDMA: 850, 1900

GSM: 850, 900, 1800, 1900

CDMA: 850, 1900

4G LTE: 2, 4, 5, 12, 13, 25, 26, 41, 66, 71

WCDMA: 2, 4, 5

GSM: 850, 900, 1800, 1900

Data Technology GPRS EVDO r0 LTE (Cat 4) 1xRTT LTE (Cat 6)
Features 
Barometer - - - - Yes
Fingerprint Reader - - Yes
stand-alone
- Yes
Flashlight - - Yes - Yes
GPS / Location - Yes n/a n/a n/a
Accessibility
Hearing Aid Compatible - Yes
M4 (very compatible)
Yes
M4, T3 (mostly tele-coil compatible)
- Yes
M3, T3 (mostly tele-coil compatible)
Multiple Languages Yes Yes n/a n/a n/a
TTY/TDD (Digital) - Yes Yes Yes Yes
Alerts
Extra Display - Yes - - -
Ringer Profiles - - - Yes -
Connectivity
Bluetooth - Yes Yes - Yes
USB - Yes Yes
USB Type C
Yes Yes
USB Type C
Wi-Fi - - Yes
5 (802.11 ac,b,g,n)
- Yes
5 (802.11 a,ac,b,g,n)
Contacts
Picture ID Yes Yes n/a n/a n/a
Ringer ID Yes Yes n/a n/a n/a
Voice Dialing - Yes n/a n/a n/a
Customization
Custom Graphics Yes Yes n/a n/a n/a
Custom Ringtones Yes Yes n/a n/a n/a
Data & Network
Data Tethering - Yes n/a n/a n/a
WAP / Web Browser Yes Yes n/a n/a n/a
Input
Predictive Text Entry Yes Yes n/a n/a n/a
Side Keys Yes Yes Yes Yes Yes
Text Keyboard, Hardware - Yes - Yes -
Touch Screen - - Yes
Capacitive
- Yes
Capacitive
Memory
Memory Card Slot - Yes Yes - Yes
Messaging
Email Client - Yes n/a n/a n/a
EMS / Picture Messaging Yes - n/a n/a n/a
Instant Messaging - Yes n/a n/a n/a
MMS Yes Yes n/a n/a n/a
Text Messaging Templates Yes Yes n/a n/a n/a
Music
Headphone Jack (3.5mm) - - Yes - Yes
Music Player - Yes n/a n/a n/a
Stereo Speakers - - - - Yes
Power
Fast Charging - - Yes - Yes
Productivity
Alarm Yes Yes n/a n/a n/a
Calculator Yes Yes n/a n/a n/a
Calendar Yes Yes n/a n/a n/a
To-Do List Yes - n/a n/a n/a
Voice Memo Yes Yes n/a n/a n/a
Software
BREW - Yes n/a n/a n/a
Games Yes Yes n/a n/a n/a
Java (J2ME) Yes - n/a n/a n/a
Voice
HD Voice - - - - Yes
Headset Jack (2.5 mm) Yes - n/a n/a n/a
Speaker Phone Yes Yes Yes - Yes
  Samsung SGH-X640 Samsung SCH-U740 Alias ZTE Blade Max 3 / Max Blue BlackBerry 7750 TCL 40 XL / Jitterbug Smart 4
  X > < X > < X > < X > < X

NOTE: Differences are highlighted with bold / black text for visual clarity only.

 
Phone Samsung SGH-X640 Samsung SCH-U740 Alias ZTE Blade Max 3 / Max Blue BlackBerry 7750 TCL 40 XL / Jitterbug Smart 4

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