I don't think that's what's being asked for. What would be valuable here is simply having a GSM/LTE radio with sim slot. I realize it would most likely be prope

I don't think that's what's being asked for. What would be valuable here is simply having a GSM/LTE radio with sim slot. I realize it would most likely be properitery/closed source (are there open source cell antennas/firmware?) but at least having that option would be way more useful than Wi-Fi.