Is there a charge for SMS verification of Wenzhou epidemic prevention code?

Wenzhou epidemic prevention code SMS verification is free.

"Wenzhou Epidemic Prevention Code" uses the interface provided by the Ministry of Industry and Information Technology. According to the safety requirements, it must be verified by SMS. At present, the algorithm is used to set the effective time of the trip, and everyone is slightly different. If the code is not flashed again within the valid time period, you need to get the verification code again at the "invalid time"; If the code is lit for the second time within the effective time period, the "update time" and "expiration time" change synchronously, and the effective time is prolonged, so as to minimize the number of times of inputting SMS verification code and enhance the sense of experience.