from the lack of any hits in the forum i assume that this is not yet supported on either of the current Teracube phones, but just in case: are eSIMs supported? if not, is it a hardware or software issue? and if software, could they be supported in a future update?
since an eSIM eliminates the need for yet another plastic SIM card, they seem like a much more sustainable option. of course i know very little about them besides what Wikipedia says and the few network providers that have starting advertising their availability.