1. Maybe the input check code does not match the picture.
2. The network platform may be faulty or under maintenance.
3. It may be that the SMS has a valid time limit of three to five days, after which the verification code will be invalid.
4. There may be something wrong with the signal receiving ability of the mobile phone.
5. It may be that the mobile phone is in arrears, which makes it impossible to receive SMS.
6. It may be that the storage space of the mobile phone is insufficient to receive short messages.
7. You can try to reinstall the application or change the network environment, and then try to receive the verification code.
8. You can try to use the inquiry platform provided by SMS operators for inquiry.
9. You can try to use third-party software to conduct a comprehensive inspection and antivirus of your mobile phone.
10. You can try to pull out the mobile phone card, reinstall it and restart the phone.
1 1. You can try to restore the factory settings of your mobile phone and reinstall Suzhou Tour APP.
12. You can try to contact the operator or mobile phone manufacturer for consultation and maintenance.
These are possible solutions. If the problem still cannot be solved, it is recommended to contact the customer service or technical support team of the relevant platform for further consultation and solution.