I own one of these and think that it is a great phone for the price.
Please note that there is no Band 28 and NFC.
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Specs:
Brand Name: xiaomi
Unlock Phones: Yes
Google Play: Yes
Battery Type: Not Detachable
Display Resolution: 1920x1080
Operation System: Android
Front Camera: 5MP
CPU Manufacturer: Qualcomm
Design: Bar
CPU: Octa Core
Language: Russian,Italian,German,French,Spanish,Polish,Turkish,Portuguese,English
Feature: MP3 Playback,Touchscreen,GPS Navigation,Message,Bluetooth,Front Camera,Video Player,HD Video Player,Wi-Fi,Email
Xiaomi Model: Mi A1 4GB 64GB
Thickness: Ultra Slim(<9mm)
Talk Time: 6-10h
SIM Card Quantity: Dual SIM Cards
Release Date: 2017
Touch Screen Type: Capacitive Screen
Cellular: GSM/WCDMA/LTE
Battery Capacity(mAh): 3080mAh typ /3000mAh min
Camera Type: 2 Back Cameras
RAM: 4G
Camera: 12.0MP
Item Condition: New
Recording Definition: 1080P
Band Mode: 2SIM/Multi-Bands
Display Size: 5.5
ROM: 64G
Display Color: Color
Size: 155.4mmX75.8mmX7.3mm
Does anyone use this on Optus or an Optus reseller in Brisbane and can comment on connectivity regarding no B28?