Joke Collection Website - Public benefit messages - Why didn't I reply to the instruction sent by SMS to the gps locator device?

Why didn't I reply to the instruction sent by SMS to the gps locator device?

It may be caused by the following four factors:

1. If the device has no cell phone signal or is turned off, dial the SIM card number on the gps locator device of Chedai 'an to see if there is a normal connection sound;

2. Whether the SMS function is enabled in check card;

3. Are there too many short messages stored on the check card?

4. SMS gateway may be delayed.