Recently topped up my minutes so that service is still available. Still on 3G. I picked up a 4G sim card; staff don't know too much about what's happening, but that's business as usual at most businesses.
Back of the SIM package reads:
To use our service, your phone
must meet the following requirements:
Unlocked: Your phone must not be ties to another carrier'
4G capable: Supports high-speed LTE networks.
Supports LTE bands 2,4,7, and 66: These are the specific frequencies we use.
VoLTE (Voice over LTE): Enables clear voice calls over LTE.
My phone doesn't support LTE band 66, so I'll have to wait to see how things play out.
Found this site to determine if your phone is compatible:
frequencycheck.com/