The Blacklist feature is added on simcardsms panel from where if sms sender using simcard sms adds mobile number then system can not sent sms on that number.
and also if receiver wants to stop getting sms from simcard sms then he or she just can reply stop. the system automatically add mobile number on blacklist. to to remove
mobile number from blacklist simcard sms user need to remove manually that number if again send sms on that number.
simcardsms.com is registered for visitors and users.