What to do if the inserted SIM card on the Alcatel One Touch Idol Ultra is not detected?

The sim card slots not detecting when i insert my simcard.
What to do so that it will detect the sim card again.

Every sim card 3,Vodafone, orange 02, etcis rejected by my ALCATEL one touch pop 7 Tablet, saying sim card not recognized, sim not detected, its an unlocked T-Mobile Alcatel one touch pop 7 Tablet

My phone won't lock the sim card in place.

Why sim accept no slot 1
No sim card detected

Try using the SIM on other phones, if it still is the same, then you have a faulty SIM card. If it works in other phones, then your Alcatel One Touch Idol Ultra's SIM card slot has a problem.

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