Screen size
Energy S550Winner: 5.5"+9.1%
U506S5.0"
Quick verdict
Energy S550 leads the measured specs 7-4.
Measured wins
Energy S550
7
spec wins
Overall winner
Ties
6
equal specs
U506S
4
spec wins
Screen size
Technology
Energy S550
GSM / HSPA / LTE
U506S
GSM / HSPA / LTE
2G bands
Energy S550
GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2
U506S
GSM 850 / 900 / 1800 / 1900
3G bands
Energy S550
HSDPA 900 / 2100
U506S
HSDPA 850 / 900 / 2100
4G bands
Energy S550
1, 3, 7, 20
Resolution
Refresh rate
Peak brightness
Pixel density
CPU speed
RAM
Storage
Main camera
Front camera
Battery
equal specsWired 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 S550
HSPA 42.2/11.5 Mbps, LTE Cat4 150/50 Mbps
U506S
HSPA, LTE
Announced
Energy S550
2017, December. Released 2017, December
U506S
2023, November
Status
Energy S550
Discontinued
U506S
Available. Released 2023, November
Dimensions
Energy S550
154.8 x 78.2 x 8.8 mm (6.09 x 3.08 x 0.35 in)
U506S
144.8 x 72.4 x 11.6 mm (5.70 x 2.85 x 0.46 in)
Weight
Energy S550
180 g (6.35 oz)
U506S
178 g (6.28 oz)
SIM
Energy S550
Nano-SIM + Micro-SIM
U506S
Nano-SIM + Nano-SIM
Type
Energy S550
IPS LCD
U506S
IPS LCD
Size
Energy S550
5.5 inches, 83.4 cm2 (~68.9% screen-to-body ratio)
U506S
5.0 inches, 68.9 cm2 (~65.7% screen-to-body ratio)
Resolution
Energy S550
720 x 1280 pixels, 16:9 ratio (~267 ppi density)
U506S
480 x 854 pixels, 16:9 ratio (~196 ppi density)
OS
Energy S550
Android 6.0 (Marshmallow)
U506S
Android 13 (Go edition)
Chipset
Energy S550
Mediatek MT6737 (28 nm)
U506S
-
CPU
Energy S550
Quad-core 1.3 GHz Cortex-A53
U506S
Quad-core 1.5 GHz
GPU
Energy S550
Mali-T720
U506S
-
Card slot
Energy S550
microSDXC (uses shared SIM slot)
U506S
microSDHC
Internal
Energy S550
8GB 1GB RAM
U506S
32GB 2GB RAM
Other
Energy S550
eMMC 5.0
U506S
eMMC 5.1
Single
Energy S550
13 MP, AF
U506S
-
Features
Energy S550
LED flash
U506S
LED flash
Video
Energy S550
720p@30fps
U506S
1080p@30fps
Dual
Energy S550
-
U506S
5 MP Auxiliary lens
Single
Energy S550
5 MP
U506S
2 MP
Video
Energy S550
U506S
1080p@30fps
Loudspeaker
Energy S550
Yes
U506S
Yes
3.5mm jack
Energy S550
Yes
U506S
Yes
WLAN
Energy S550
Wi-Fi 802.11 b/g/n, Wi-Fi Direct
U506S
Wi-Fi 802.11 a/b/g/n
Bluetooth
Energy S550
4.0, A2DP, LE
U506S
4.0, A2DP
Positioning
Energy S550
GPS
U506S
GPS
NFC
Energy S550
No
U506S
No
Radio
Energy S550
FM radio
U506S
FM radio
USB
Energy S550
microUSB 2.0
U506S
microUSB
Sensors
Energy S550
Accelerometer, proximity
U506S
Accelerometer, proximity
Type
Energy S550
Li-Ion 3000 mAh, non-removable
U506S
Li-Ion 3000 mAh battery, removable
Stand-by
Energy S550
Up to 400 h (3G)
U506S
-
Talk time
Energy S550
Up to 10 h (3G)
U506S
-
Colors
Energy S550
Black
U506S
Black
SAR
Energy S550
0.28 W/kg (head) 1.23 W/kg (body)
U506S
-
Price
Energy S550
About 120 EUR
U506S
About 60 EUR