It is possible. You need Yealink WLAN Adapter WF40
Yealink WLAN Adapter WF40 . Here are the instructions
https://www.youtube.com/watch how to configure it. The first important step is to update the firmware of the phone because the older firmware versions did not have Wi-Fi functionality.
There is also a Bluetooth adapter
Yealink Bluetooth Adapter that allows you to connect the phone to Bluetooth headsets.
Unfortunately, T48G has only one USB slot. So you can't have both Bluetooth and Wi-Fi at the same time.
Some of the newer Yealink 5 generation models have both Bluetooth and Wi-Fi (2.4 GHz) built in.
Like for example with:
Yealink SIP-T56A
Yealink SIP-T56A or
Yealink SIP-T58A
Yealink SIP-T58A
They are not much more expensive than T48G. If you need Bluetooth and/or Wi-Fi, they might be a better choice than T48G.
