Twilio Scheduled SMS: A Guide to Automated Messaging

Twilio Scheduled SMS is a powerful tool that allows you to send automated messages at a specific time or date. This feature is perfect for businesses that want to send reminders, notifications, or promotional messages to their customers.

You can schedule SMS messages up to 2 years in advance, giving you plenty of time to plan and coordinate your messaging campaigns. This feature is especially useful for events, holidays, or special promotions.

To use Twilio Scheduled SMS, you'll need to create a new message and select the "Schedule" option. From there, you can choose the date and time you want the message to be sent.

For more insights, see: Twilio Voice Message

To get started with Twilio Scheduled SMS, you'll need an OS that supports .NET. This includes Windows, macOS, and Linux.

First, ensure you have the .NET 6 SDK installed. If you're using an older version of .NET, you can still follow along, but you may need to make some adjustments.

Next, choose a code editor or IDE. The recommended options are VS Code with the C# plugin, Visual Studio, or JetBrains Rider.

You'll also need a Twilio account, either free or paid. If you register through Twilio, you'll receive $10 in credit when you upgrade to a paid account.

Finally, have a phone handy to receive the SMS messages.

Here are the required items in a concise list:

Twilio Now Supports Message Scheduling for SMS and MMS. This feature allows you to send appointment reminders the evening before the appointment to remind the customer about the appointment tomorrow.

Message Scheduling eliminates the need for complex server schedules to be running each day. It also introduces more sophistication to your messages based on business requirements.

You can schedule messages to be sent before, during or after business hours depending on the nature of your messages to promote customer engagement. This is particularly useful for appointment reminders for a Monday appointment which would have to be sent on a Sunday or have a server schedule setup.

For more insights, see: Twilio's Whatsapp Business Api Page.

Twilio, one of the recommended Gateways, has never supported message scheduling for SMS and MMS as well as WhatsApp messages until now. They introduced Message Scheduling as a Public Beta earlier this year and it's now globally available.

You can schedule a new message by selecting the required date and time you wish to send a message.

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API Documentation is crucial when working with Twilio's Scheduled SMS feature. You'll need to refer to the Twilio Docs for API reference documentation, SDKs, helper libraries, quickstarts, and tutorials for your language and platform.

To create a scheduled message, you'll need to understand the required parameters, which include ScheduleType, SendAt, MessagingServiceSid, Body or MediaUrl or ContentSid, and To. These parameters have specific requirements, such as the ScheduleType needing to be fixed, and SendAt needing to be a datetime string in ISO-8601 format.

Here's a quick rundown of the required parameters:

API documentation can be overwhelming, but understanding the required parameters is a great place to start. You'll need to include a parameter called ScheduleType with a value of fixed to indicate that the message should be sent at a fixed time in the future.

This parameter/value combination is crucial for Twilio to know that the message should be sent at a specific time. You can't just send a message with a fixed schedule type - it needs to be combined with a SendAt parameter.

The SendAt parameter requires a datetime string in ISO-8601 format, which is a standard way of representing dates and times as a string. This format is like 2021-11-30T20:36:27Z.

You'll also need to include the MessagingServiceSid, which is the SID of the messaging service that will be sending the message. Without this SID, Twilio will treat the message as a non-scheduled message and send it immediately.

Here are the required parameters summarized in a table:

Remember, messages must be scheduled at least 5 minutes before the intended send time and no more than 35 days before the intended send time. This means you need to send the POST request to create the Message resource within these time limits.

API documentation can be overwhelming, but having the right resources can make a big difference. Twilio Docs offers a comprehensive set of tools to help you get started with their API.

API reference documentation is available, which provides a detailed overview of the API's functionality. SDKs, helper libraries, and quickstarts are also included to make integration easier. Tutorials are available for specific languages and platforms.

When you send a POST request to Twilio, you'll get a response that tells you whether your message was scheduled successfully or not. This response is crucial in determining the next steps.

If your request is valid, Twilio returns a 201 (scheduled) HTTP status code. This means your message is scheduled and ready to be sent.

If your request is invalid, Twilio returns a 400 HTTP status code. This indicates that there's something wrong with your request.

You can check the status of the scheduled message in the body of the response from Twilio. The status will be set to "scheduled".

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The SID of the scheduled Message resource is also included in the response. This is found via the sid property of Twilio's response. You should save this SID in case you need to cancel sending the message.

Here's a summary of the HTTP status codes you can expect:

In C#, you can cancel a scheduled SMS as long as it hasn't been delivered yet.

You'll need to update your code to ask if you want to cancel a scheduled message and then prompt for the SID of the message.

The SID of the message is required to cancel it, so make sure you have it handy.

To cancel a scheduled message, update the status to "Canceled" in your code.

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Twilio's scheduled SMS feature allows you to send messages at a specific time, making it ideal for appointment reminders and other business-critical messages.

You can create a scheduled message by adding two parameters: ScheduleType and SendAt, to a Message resource.

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This eliminates the need for complex server schedules to be running each day, promoting customer engagement and making your messaging more sophisticated.

Scheduling a new message is as simple as selecting the required date and time you wish to send a message.

Message scheduling is now globally available on Twilio, one of the recommended Gateways that we have partnered with for many years.

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Message scheduling is a game-changer for businesses that want to send messages at specific times. You can schedule a message to be sent at a later date and time, making it perfect for appointment reminders or promotions.

To schedule a message, you need to create a Message resource with a Status of scheduled, and include two additional parameters: ScheduleType and SendAt. This is a bit more complex than sending a normal message, but it's still relatively straightforward.

Message scheduling is now globally available on Twilio, one of our recommended Gateways. This means you can use it for both regular SMS/MMS messages and WhatsApp messages.

With message scheduling, you can send messages before, during, or after business hours, depending on your business needs. This can help promote customer engagement and make your messages more effective.

If a user opts out of receiving messages, scheduled messages to that user will still be sent at the scheduled time. However, you can cancel the remaining scheduled messages to that user if you want to.

If this caught your attention, see: Twilio Whatsapp Business Api

You're allowed to send a lot of scheduled messages, but there's a limit. Each Account, including Subaccounts, can have up to 1,000,000 scheduled messages at any given time.

Subaccount limits are separate from the parent Account, which means they don't count towards the parent's allocation.

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