Step 1: Read the install documentation.
Step 2: Read the forum guidelines.
Step 3: Ensure you use a RPi3b+ and not a RPi3a.
The RPi3A+ has 512Mb of RAM. HASOS has a realistic minimum requirement of 1Gb of RAM, and really needs 2Gb+.
Set the phone as a WLAN hot-spot and use Wi-Fi.