That's going to be hard for people on criminal home confinement. Those anklets connect to a base station that connects only to an analog land line. Most of those things are obsolete technology.
As the former wearer of such an appliance (also married to another former wearer of a different such appliance) I can confirm this is no longer the case.
Do they not work with an ATA (VoIP to POTS adapter)? If not currently, is this a technical matter (can’t work) or an administrative matter (detectable and not permitted)?
Don’t they have a few GPS-only units now where all the hardware is in the ankle bracelet? I work criminal-law-adjacent and I feel like I see booths for them at conventions. If so, this sounds like a great opportunity for more vendor grift… I mean government thrift.