By SMS we can send remote commands to the gps tracker manufacturer. For example, if we want to know the status of our locator, as long as we send a status command message to the device, we can receive a short message reply from the device, but sometimes we can not receive a short message reply.

So why doesn't the manufacturer receive a reply when sending a text message to the gps tracker?

There are four reasons why a user may not receive a reply when sending an SMS message to the gps tracker manufacturer:

1. The device card expires, and the device has no call charge

The card in the locator must have a call fee, if there is no call fee, it will stop, so it will lead to the text message can not be sent out, and can not receive the text message sent by others.

2. The SIM card of the device is not enabled with SMS function from the very beginning

The locator must be activated in the SIM card SMS function, the command will be effective. If the locator SIM card is not enabled with SMS, then no matter how we send the command, the locator will not respond.

3. The content of the message is incorrect

The short message sent to the device must be entered in English. If the user sends a short message in Chinese, the content of the short message cannot be recognized.

4. The SIM card number used for sending SMS messages is incorrect

Sending a text message to a device is like sending a text message to a friend. If you send a text message to the wrong number, your friend will not be able to receive the text message you sent, and will not receive a reply to the text message. Therefore, before sending a text message, be sure to send the correct number.

5. The card stores too many signals

The locator should periodically clear the stored information in the card, otherwise too much information in the card will cause the locator to receive instructions.

gps tracker manufacturer https://www.eelinktracker.com/