Hi Kimberly, Thanks for reaching out here on the forums. Is the phone you are putting the Ting Mobile SIM card unlocked? Usually, when an error of network locked appears on the phone it means that the phone has financial ties or is locked to another network and can only use a specific SIM card. A phone will need to be unlocked before it is able to use a new SIM card or network. If you are unsure if the phone is unlocked or not what I would suggest is reaching out to the original seller of the phone as they should be able to tell you the unlocked status and assist in the unlocking if needed.
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