What are some alternatives?
When comparing BulkSMS and MSG91, you can also consider the following products
Nexmo - Nexmo is a simple two way SMS API with global reach and wholesale rates
Twilio - Brings voice and messaging to your web and mobile applications.
Infobip - A2P messaging platform for enterprises, resellers & mobile operators with global network coverage.
Avochato - Text messaging for your business.
Plivo - Plivo's Voice API enables businesses to build Voice apps to reach customers globally in 200+ countries. Try Plivo's Voice API for free. Instant Sign Up.
TextMagic - TextMagic is a business text-messaging service for sending notifications, alerts, reminders, confirmations and SMS marketing campaigns.