checkIfPhoneNumberIsOptedOut
inline suspend fun SnsClient.checkIfPhoneNumberIsOptedOut(crossinline block: CheckIfPhoneNumberIsOptedOutRequest.Builder.() -> Unit): CheckIfPhoneNumberIsOptedOutResponse
Accepts a phone number and indicates whether the phone holder has opted out of receiving SMS messages from your Amazon Web Services account. You cannot send SMS messages to a number that is opted out.
To resume sending messages, you can opt in the number by using the OptInPhoneNumber action.