Where I live, the state of iowa provides a real-time corrections network.
Here I believe they use a bluetooth serial connector linked to a cell-phone that feeds real-time rtk corrections to the rtk unit.
Is your unit also setup to receive real-time corrections over a serial/bluetooth connection?
It can use RTCM3 packets furnished on any of the interfaces.
See the ZED-F9P Interface Specification for a full list of supported messages.
For BlueTooth you’d likely need an XBee / BlueTooth to establish a serial connection with an NTRIP client running on a smart-phone.