1. Double check to make sure your SIM card is inserted properly as displayed on the phone.
  2. If you are using a SIM card adapter, you may need to contact your wireless provider to get the properly sized SIM card.
  3. Verify your SIM card has clean contacts.
  4. Verify your APN settings are correct as per your carrier’s requirements.
  5. Make sure Data is turned on by going to SETTINGS and turning on Mobile Data.

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