Sim card is not detected Samsung A3 (2016)

[aibd]

In this case the other question I already asked was this:

@aibd

worth checking if you go to Settings > Network and internet > Mobile network do you see your carrier mentioned by name? (This would double check that the card is really not detected.) I do often get the situation where I have to ask my carrier to send APN (Access point names) found under > Advanced from the above point.

There is a trick you might do now; a Force stop. Press Vol down + Bixby + Power for > 7 seconds and a reboot will happen. Test for SIM again.

• Set up and troubleshoot a mobile data connection (3G/4G)
• New user: no mobile internet service
  The first link helps you go through some things you might have overlooked as /e/ can seem a bit “different” to start with.

If you get to “Reset to default” with no luck, it is time to contact the carrier, explain your predicament and ask them to send you the settings. They may be under the impression that this should have happened automagically (perhaps in /e/ the magic is different).

(More ideas perhaps from a search using this link https://community.e.foundation/search?expanded=true&q=APN%20 )