If you could do the radio swap (assuming they are compatible) you'll run into the issue of the 4g adapter not working then. There are other postings on here but to sum up, the radios are coded to your Vin. So that service can't be activated if you swap your radio with one from a newer vehicle. Having said this, as I've mentioned previously, go with a 3rd party unit if you want to have remote start via your phone or gps tracking. Viper or Dronemobile have these options.I was told today (11/22/21) that the Tmobile OBD II dongle is not available for the Jeep Cherokee. Only the Jeep Grand Cherokee. I would have the same questions it looks like a lot of people have with no real answers from Jeep or Uconnect. Is the 2015 Cherokee upgradable to the 2018 HUD? If so would that make it so the 4G works or at least the OBD II dongle adapter an option to adapt to 4G? Knowing that this was going to be an issue does FCA or any after market companies have a fix whether hardware or software?