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[Why] is a SIM card required to create a Wi-Fi hotspot on the Samsung Galaxy S23 Ultra's distribution of Android 13?
As also asked at https://android.stackexchange.com/q/262286, I read
No SIM card
Insert a SIM card to use Mobile Hotspot and other tethering options.
Why is a SIM card required to create a Wi-Fi hotspot on a phone?
I have a Samsung Galaxy S23 Ultra running Android 13.
1 answer
It's not. No modern smartphone's hardware is designed such that it requires a SIM card inserted for its firmware to permit requests to create broadcast an SSID. Similarly, nor does AOSP:
You can confirm by adhering to what stackoverflow.com/a/79814523 describes, if you can't be bothered to remove your own SIM. Don't utilise waydroid-1.5.4-5.fc43 for this. [2]
Darwin-based OSes
Some versions of i(Pad/Phone)OS appear to restrict this. [3] For those versions, no workarounds exist, except installing another OS. [4]

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