Via SMS we can send remote commands to a 4g lte gps tracking device. 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 can't I get a reply when I send a text message to a 4g lte gps tracking device?
There are four main reasons that cause users to send SMS messages to 4g lte gps tracking device to receive no reply:
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.
Of course, if you exclude the above five situations, the SMS still did not reply, you can not ask the business to change the card, or let the business help troubleshoot the locator problem.
4g lte gps tracking device https://www.eelinktracker.com/4G-GPS-Tracker/
