Can I Tether 2 Mobile Phones via Bluetooth on Mac?

Most Macs can only connect to one Bluetooth device at a time. This is because Macs can only have one module built into it for a connection at any given time. So, in order to tether 2 mobile phones via Bluetooth on your Mac, you need to have another Bluetooth adapter plugged into your Mac.

Alternatively, you can try tethering your second Android or iOS device to your Mac via USB or Wi-Fi instead of Bluetooth: