Opt-In means to Opt for a particular service. If client want to send SMS from transactional route to unknown subscriber then he need to request the subscribers to Opt for such services. Subscriber can send an SMS with the opt-in keywords to provided number. Once subscriber receive an SMS, he would be considered under Option group and would be liable to receive SMS.
Modified on: Fri, 21 Jul, 2017 at 4:59 PM
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