1. Find the location of the SIM card slot of the navigation device: First, you need to determine what type of SIM card is used by the navigation device and find the location of the SIM card slot. The SIM card slot is usually located on the back or side of the navigation device.
2. Turn it off and take out the old SIM card: Be sure to turn it off before replacing the flow card. Then, find the SIM card slot, open it, and carefully take out the old SIM card. Make sure not to grab or twist the SIM card forcibly to avoid damage.
3. Insert a new flow card: After taking out the old SIM card, carefully insert the new flow card into the SIM card slot of the navigator. Make sure that the card is inserted in the correct direction to avoid card insertion errors.
4. Restart the navigation equipment: After replacing the flow card, close the SIM card slot and restart the navigation equipment. If all goes well, the navigation device will recognize the new flow card and start using the data service it provides.
It should be noted that different navigation devices may have different operation steps. If you are not sure how to replace the flow card, it is recommended to consult the user manual of the corresponding equipment or contact the equipment manufacturer for detailed operating instructions.