You basically have two choices:
1) Buy the internal WiFi card from Microbit. Then turn on your phone's hotspot and connect
to it and you are already there.
2) Buy an external WiFi bridge. This is cheaper, but is one more box to carry around.
There are other advantages and disadvantages to both solutions:
The internal card can only be used for normal connections using standard encryption, such as WPA2.
It will not work in public hotspots where you must first log onto a browser and click on a form,
such as in a hotel (i.e. authentication over a Radius server).
The external bridge allows you to allow use public hotspots as well. You first connect to a PC and sign in,
then move the bridge to the RRC for its use.
I personally use a small portable bridge for flexibility. The Netgear WNCE2001 I use is no longer available.
73,
Mitch DJ0QN / K7DX