- Confirm whether the card insertion method is correct (SIM Cardinserted with metal side down, and the notch end is facing inward);

- Do not insert or remove the SIM card when the product is turned on.

The product must be turned off to remove and insert the SIM card.

- When it appears that it needs to be updated, please click the "Cancel" button (Don't update or delete the software preloaded on the product).

- Settings - Network and Internet - APN, manually adjust it;

- Insert the SIM card into the Android phone and check the information parameters of the APN in the phone.  Then in the product settings network and Internet - APN - right upper corner "+" sign, add APN parameters (add according to the parameters in the mobile phone);

- If you need a video tutorial of the operation, please contact the store customer service directly.