When android client develops SMS verification code, does it process data in the background or in the foreground?

First, you need to know how to check the SMS verification code.

When the client requests the SMS verification code, the verification code platform (free and cheap) will send a verification code to your server and a verification code to the client. This verification code has a time limit. When the user fills in the verification code, it will be matched with the server verification code, and if it is equal, it will pass.

Without the server, the verification code platform will only send the verification code to the client, and the verification code filled by the user matches the verification code of the verification code platform. If the verification code platform is confirmed to pass, it will return a pass data to the customer service end.