Device doesn't recognize sim card

SOURCE: My nokia 5800 won't recognise my sim card

This is a new type of phone. Your sim card might be too old for the phone to recognize it. You should go to your carrier and ask for a new sim card. They should be able to replace the old one without extra cost.

SOURCE: i9 phone won't recognize sim card and dial out or receive

In any other phone the shiny gold bars go face-down, but with the i9, the gold bars face up-wards.

SOURCE: Motorola Razr says insert SIM card when it's already in there

You May Have Fryd Ur Sim Card Did U Try Puttin It In Any Other Phones Besides The Other Model?

SOURCE: my lg vu does not recognize the sim card.

When a SIM works in other phones and no other SIMs work in the particular phone, there is a phone issue. Somehow it has become corrupted and it will need replaced promptly. If purchased new from AT&T less than one day ago, it is under warranty as long as there is not liquid or physical damage. If purchased refurbished from AT&T less than 90 days ago, it is under warranty as long as there is not liquid or physical damage. If neither of these apply and you have insurance, use it and there will be a $50 deductible applied to your next bill. If not purchased from AT&T, seek replacement from ebay, craigslist, or a gophone (put your sim in the phone... it will have your phone number, contacts, and information and you won't have prepaid service).

SOURCE: Phone does not read/recognize SIM card

plz restore ur mobile