This is your resource to discuss support topics with your peers, and learn from each other.
After last december update dev.alpha does not recognized SIM card. Is this a known issue or something else?
I don't believe it's a known issue. You can contact firstname.lastname@example.org for help with this.
try another sim card? maybe follow correctly the instructions from the manual? maybe you have inserted it in the wrong direction? How did you confirmed the sim is not read?