3 basic rules you should know about

Rule #1: consent from the user

Make sure the messages you send are for recipients who have accepted your company’s (marketing) messages. We recommend that this be included in your Terms & Conditions or even a separate tick box when people agree that their contact details should be stored in your system. This type of information is what we call ‘opt-in proof’ which connects to rule # 2: providing an opt-out option.

Rule #2: providing an opt-out option

Generally, recipients need to be able to opt-out of your messages. Some countries have rules and regulation guarding customer contests and some operators may even have their own standards in this regard. We recommend you to include a Darbird number in your message which allows people to:

  • Allow them to request or agree to receive information from you (opt-in).
  • Let you know if they don’t want to receive any more of your messages (opt-out).

Rule #3: validity of the company

When using your company name as the sender ID, it needs to be a valid existing company. Sending messages in the name of a third party or a copyrighted trademark for which you don’t have the rights or license to send messages as can lead to severe legal implications including a definitive block from our platform.

Is there a daily or monthly minimum quota for sending SMS?

No, you can send as few or as many SMS, over as long or short a period as you like!

Are there any other costs involved when using Darbird?
Your Darbird account is completely free, for sending SMS all you need is prepaid credit unit and the charge is just per SMS that you send out.
In some countries, depending on local restrictions, you might need a  Number to send with and to receive replies; these are paid via a from your balance.
How many contacts can I send the same SMS message to?
With Darbird you can send out messages to a large number of contacts via our ‘Bulk Messaging’ feature or our ‘Send Campaign’ feature. We would recommend sending  to a maximum of 50.000 contacts at once.
When sending through the API you can send to 50 contacts per API call as also described in our API documentation.
What does ‘alphanumeric’ mean?

An ‘alphanumeric sender ID’ is a sender ID which consists of letters and numbers.

‘Alphanumeric’ includes any characters in these ranges:

  • a-z
  • A-Z
  • 0-9
  • The underscore _

To learn more about the sender ID, visit here


Global SMS coverage, all languages
With our host support, we cover all networks worldwide with over 900 direct and one-hop connections!
Don’t worry, you’ll be able to reach your customers anywhere in the world. We’re directly connected to over 220 global operators and we support all languages in SMS.
Who pays for failed messages?

We charge you for every SMS sent from the account. We will send every SMS that you submit to us, whether it is sent to an absent or an invalid number, or to the operator, who then, in turn, will try to deliver the SMS.

We are charged by our operator, which is why we, in turn, charge you so it’s very important that you submit the numbers correctly and check if there are any country and operators restrictions who might block your messages. if you have problem with failed SMS, you can send us an email

Are there restrictions for SMS messaging?
Is there a daily or monthly minimum quota for sending SMS?

No, you can send as few or as many SMS, over as long or short a period as you like!