When you sent the sms form your phone, it is considered as transactional sms and it carries a very high priority for delivery.
But if you use the external services to send the sms then there are two types of sms.
- Promotional (offers, news etc)
- Transactional (For bank account activity, password reset)
By default, Twilio provides the promotional sms, in promotional sms they have two variants - Free user and paid user. Off-course paid user will get the high priority in the queue.
For the Transactional sms, you have to fill a form and your have to provide a sms template to the Twilio team and only paid user can apply for the Transactional sms.
Note: You will not receive the Promotional sms between 9 PM to 9 AM.