I, Mother Mychaela, consider all cellular technologies newer than GSM/2G to be morally wrong — it is my personal opinion, and I do not feel any need to justify it. However, I am not principally opposed to supporting those newer technologies — but I do impose some very strong ethical requirements:
All mainstream vendors of cellular modem chipsets and modules for 4G, 5G etc are immoral in that they refuse to publish their firmware source code in the same way how we (FreeCalypso) freely publish our modem firmware source code for GSM/2G. For this reason, I will never accept, endorse, use or associate with any phone design that uses any one of those immoral chipsets. Instead the only ethical way to connect to a 4G/LTE network for the purpose of accessing VoLTE services would be to use an SDR device driven by srsUE software in the place of the conventional (and immoral) 4G/5G modem chipset.
It is morally impermissible in my book to build a phone that supports only 4G/5G/etc, without support for GSM/2G. I do approve, however, of a potential hybrid solution supporting both: use our FreeCalypso Tango module for GSM/2G support, use an SDR+srsUE combo for 4G/LTE support (and maybe 5G too, if it is needed for a VoLTE-only terminal without any user-accessible Internet data functionality), and intertie srsUE software for LTE mode with FC firmware (running on the Tango module) for GSM mode, so they share the same USIM and select among available GSM or LTE networks based on a user-controlled order of preference, as opposed to each component trying to find a network and register on its own.
It must be possible for a user to set an inverted order of preference, such that the phone would preferentially choose GSM/2G over LTE/4G when both services are available.