https://www.youtube.com/watch?v=weKF4qgtLrY
Basic Description
 Model  Ulefone T1
 Band   2G: GSM 1900/1800/850/900MHz
3G: WCDMA 2100/1900/1700/850/900MHz 
       CDMA 2000MHz
4G: FDD-LTE B1/B2/B3/B4/B5/B7/B8/B12/B17/B19/B20 
       TDD-LTE B38/B39/B40/B41
 Sim Card   Dual sim dual standby, Dual Nano Sim
Card slot 1 supports Nano-SIM Card
Card Slot 2 supports Nano-SIM Card/TF Card
 Style  Bar
 Color  Black/Gray/Red
 Shell Material metal
 System
 OS Android 7.0
 CPU    MTK Helio P25 Octa core
 GPU    ARM Mail-T880 1GHz
 ROM    64GB
 RAM    6GB
 Card Extend    Yes, support external Micro SD/TF card up to 256GB
 Screen
 Display Size   5.5 Inch 
 Resolution 19201080 pixels 
 Glass  Corning Gorilla Glass 3
 Support Format
 Video File Format  3GP/MPEG4
 Audio File Format  MP3/WAV/AMR/AWB
 FM Yes
 Earphone Port  3.5mm
 Data Transfer & Connectivity
 Data transfer  USB/Bluetooth
 Mobile internet    WAP/WiFi
 General 
 Camera/Picture Resolution  Front: 8MP (Interpolated to 13MP) Camera
Back: 16MP+5MP Dual Camera
Two-tone Quad flash, Touch focus
Video recording: 1080P 60fps
 Language   (More details please refer to the screenshots) 
GPS Build in GPS
WIFI    Yes, 802.11 a/b/g/n, 2.4GHz/5GHz
Bluetooth   Yes, V4.1
 HiFi   FS1601U
 Fingerprint Scanner    Yes
 Gravity Sensor Yes
 Gyro Sensor    Yes
 P-Sensor   Yes
 L-Sensor   Yes
 Compass    Yes
 Accelerometer  Yes
 OTG    Yes
 Multi-Touch    Yes
 Dimensions 15576.9*8.45mm
 Net Weight
(Including battery) 181g
 Battery    3680mAh battery, Built-in
 Quick Charge   PE+2.0
 USB type   USB 2.0 Type-C
 Other Features 3G, 4G, GPS, FM, Bluetooth, Ebook, Email, 
Messaging, wallpapers, calendar, calculator, clock, camera, 
tethering & portable hotspot, etc
 Package included   1 x Ulefone T1 Smartphone
1 x Phones Stand with Finger Ring
1 x Protective Case
1 x Protective Film
1 x Power charger adapter
1 x Sim Needle
1 x Data Cable
1 x EU charger




4G: FDD-LTE B1/B2/B3/B4/B5/B7/B8/B12/B17/B19/B20
TDD-LTE B38/B39/B40/B41
So no band 28?