Can I use it next time after SMS verifies my friend's micro-signal?

SMS verification is used to verify the identity of the mobile phone number, not to verify the micro signal. After using the mobile phone number to verify, the friend's micro-signal was successfully added, and the micro-signal can still be used the next time you log in to WeChat, without SMS verification again. Verifying the mobile phone number is mainly to ensure that you have the mobile phone number, which can be used as a way of authentication to protect the security of the account.