Just curious, are there any special limitations on networking connections with the base Android OS? Does Android support additional modems and/or connection modes beyond the SoC? For instance, if I wanted to affix a satellite phone antenna (and I know those are very bulky), would there be anything in either the Android software or Moto Mods protocol that'd prevent me from doing so? I know, for instance, you can't affix an external GPU or add RAM, but what about telephony? Also, to be more explicit, what about adding a second SIM card? Would there be restrictions there?
Good idea, but if you want to learn more information please refer this link (https://developer.motorola.com/ ) that is moto mods knowledge for developer.
if you are a company, you are interesting to develop this product as partner, you can contact moto by this link ( https://developer.motorola.com/partner/ ).