Screen size
Energy 400 LTE4.0"
U506SWinner: 5.0"+20%
Quick verdict
U506S leads the measured specs 9-4.
Measured wins
Energy 400 LTE
4
spec wins
Ties
5
equal specs
U506S
9
spec wins
Overall winner
Screen size
Technology
Energy 400 LTE
GSM / HSPA / LTE
U506S
GSM / HSPA / LTE
2G bands
Energy 400 LTE
GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2
U506S
GSM 850 / 900 / 1800 / 1900
3G bands
Energy 400 LTE
HSDPA 900 / 2100
U506S
HSDPA 850 / 900 / 2100
4G bands
Energy 400 LTE
3, 7, 20
Resolution
Refresh rate
Peak brightness
Pixel density
CPU speed
RAM
Storage
Main camera
Front camera
Battery
Wired charging
Weight
Thickness
IP rating
Wi‑Fi
Bluetooth
equal specsUSB
5G support
equal specsNFC
equal specs3.5mm jack
equal specsSD card
equal specsStereo speakers
U506S
1, 3, 4, 7, 8, 20, 28, 38, 40, 41
Speed
Energy 400 LTE
HSPA, LTE
U506S
HSPA, LTE
Announced
Energy 400 LTE
2017, Q3. Released 2017, Q3
U506S
2023, November
Status
Energy 400 LTE
Discontinued
U506S
Available. Released 2023, November
Dimensions
Energy 400 LTE
134 x 72 x 15 mm (5.28 x 2.83 x 0.59 in)
U506S
144.8 x 72.4 x 11.6 mm (5.70 x 2.85 x 0.46 in)
Weight
Energy 400 LTE
204 g (7.20 oz)
U506S
178 g (6.28 oz)
SIM
Energy 400 LTE
Hybrid Dual SIM (Micro-SIM, dual stand-by)
U506S
Nano-SIM + Nano-SIM
Other
Energy 400 LTE
IP67 dust/water resistant (up to 1m for 30 min)
U506S
-
Type
Energy 400 LTE
TN TFT
U506S
IPS LCD
Size
Energy 400 LTE
4.0 inches, 45.5 cm2 (~47.2% screen-to-body ratio)
U506S
5.0 inches, 68.9 cm2 (~65.7% screen-to-body ratio)
Resolution
Energy 400 LTE
480 x 800 pixels, 5:3 ratio (~233 ppi density)
U506S
480 x 854 pixels, 16:9 ratio (~196 ppi density)
Protection
Energy 400 LTE
Asahi Dragontrail Glass
U506S
-
OS
Energy 400 LTE
Android 6.0 (Marshmallow)
U506S
Android 13 (Go edition)
Chipset
Energy 400 LTE
Mediatek MT6737M (28 nm)
U506S
-
CPU
Energy 400 LTE
Quad-core 1.3 GHz Cortex-A53
U506S
Quad-core 1.5 GHz
GPU
Energy 400 LTE
Mali-T720MP2
U506S
-
Card slot
Energy 400 LTE
microSDXC (uses shared SIM slot)
U506S
microSDHC
Internal
Energy 400 LTE
8GB 1GB RAM
U506S
32GB 2GB RAM
Other
Energy 400 LTE
eMMC 5.0
U506S
eMMC 5.1
Single
Energy 400 LTE
8 MP, AF
U506S
-
Features
Energy 400 LTE
LED flash, HDR
U506S
LED flash
Video
Energy 400 LTE
Yes
U506S
1080p@30fps
Dual
Energy 400 LTE
-
U506S
5 MP Auxiliary lens
Single
Energy 400 LTE
1.3 MP
U506S
2 MP
Video
Energy 400 LTE
U506S
1080p@30fps
Loudspeaker
Energy 400 LTE
Yes
U506S
Yes
3.5mm jack
Energy 400 LTE
Yes
U506S
Yes
WLAN
Energy 400 LTE
Wi-Fi 802.11 b/g/n
U506S
Wi-Fi 802.11 a/b/g/n
Bluetooth
Energy 400 LTE
4.0, A2DP, LE
U506S
4.0, A2DP
Positioning
Energy 400 LTE
GPS
U506S
GPS
NFC
Energy 400 LTE
No
U506S
No
Radio
Energy 400 LTE
FM radio
U506S
FM radio
USB
Energy 400 LTE
microUSB 2.0
U506S
microUSB
Sensors
Energy 400 LTE
Accelerometer
U506S
Accelerometer, proximity
Type
Energy 400 LTE
Li-Ion 2500 mAh battery
U506S
Li-Ion 3000 mAh battery, removable
Stand-by
Energy 400 LTE
Up to 420 h (3G)
U506S
-
Talk time
Energy 400 LTE
Up to 16 h (3G)
U506S
-
Colors
Energy 400 LTE
Black
U506S
Black
SAR
Energy 400 LTE
0.64 W/kg (head) 1.52 W/kg (body)
U506S
-
Price
Energy 400 LTE
About 180 EUR
U506S
About 60 EUR