Bulk SMS delivery depend on many factors like capacity, region, network coverage, availability mobile phone, network in that area, mobile in use etc. All the providers assure 100% delivery to single or a group up to 100 numbers. In India we experienced many operators and interact with many providers regarding this, all have the same situation. If we send numbers above 500 result in high bounce ratio. So we advice customers to send less quantity at a time for fast and 100% delivery.
Customers are responsible for all content deliver from their account. So message sending is serious action. Never send abuse or in appropriate contents to unknown numbers. Transaction sms route is meant for solicited message action. Never send promotion materials to unknown numbers.
