I’ve seen it mentioned that GrapheneOS requried a SIM card to be enabled. Does this apply to the installation? I ask because I currently have an iPhone, and judging by my last experience switching phones, removing the Sim card from an iPhone renders it unable to connect to any kind of network. I’d like to still have a functioning phone while setting up a new one in case something goes wrong.
You do not need a simcard to set up any android phone afaik.
Also this forum is not for tech support. Questions regarding grapheneOS as best asked on discuss.grapheneos.org or just ask help in their channels.