The cheapest way sending SMS through your android phone

What are the avalable features?

• Send bulk SMS
  Use CSV or Excel file containing numbers to send bulk messages.
• Supports sending USSD requests
  It also supports sending USSD requests. You will be able to send it using web panel or API. All the responses resulted from USSD requests will be visible in web panel. You can read responses using the API, or you can also subscribe to webhook to read it as soon as they arrive. This feature requires a device with Android 8.0 or above.
• Works in background
  You don’t need to keep the Android app open on the device for it to work. This makes it easier to use it with your regular device. You won’t need a dedicated device for it.
• API 
  Send SMS from your application developed using any programming language.
• Supports very long messages
  Send SMS with virtually no limit. You won’t be bound by SMS character limit (160 Characters).
• Tracks message status/ delivery reports : Shows status of messages sent using web user interface.
• Auto responder : You can add responses for certain messages so whenever you receive that message app will reply it automatically.
• Use multiple devices to send faster : Ability to sign in using multiple Android devices to split messages between them when sending bulk messages.
• Schedule messages : Send messages on schedule.
• Supports Dual SIM devices : Send messages using any SIM programmatically or using Excel file.
• Contact lists/Send message to contact list : Create contact lists and import contacts into them using Excel file.
• Unsubscribe contacts : Ability to allow a contact to unsubscribe from the contacts list.
• Contacts API : Add contacts or unsubscribe them from the list using the API.