The Samsung S8+ supports Wireless SGX. You do not need to login every time Wireless SGX is in range. You only need to do one time setup on the S8+.
Setting up Wireless SGX
Goto Settings – Connections – Wifi
Long press the Wireless@SGX to enter the settings as below:
EAP method: PEAP
Phase 2 authentication: MSCHAPV2
CA Certificate: (Unspecified)
The identity will represent your user name. Key in your Wireless SG user name and password.
After the setup, your S8+ will automatically connect to Wireless SGX automatically when in the wifi range.