I can't find the travel itinerary code at home every day.

You can also look for the itinerary code at home every day.

Maybe I lost my mobile phone card. Quit and try again several times.

As long as you don't leave the local area, you can find the travel itinerary code;

It may be your mobile phone card, or the network is unstable and you haven't come out yet, or you haven't logged in successfully. The trip code may be delayed.