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What is an SMS sender ID?

The SMS sender ID is the text display name that you see at the top of your phone’s screen and is used to identify who sent the message. The SMS sender ID is simply who a text message is from.

What is the maximum length for an SMS sender ID?

If the SMS sender ID is alphanumeric, the maximum number of characters permitted is 11. If the sender ID is set as a numeric value, allowing the recipient to reply, then the maximum permitted number of digits is 15.

So there are two different sender ID maximum lengths, depending on whether you are using letters or numbers.

Why is there such a small limit on the number of characters permitted in a sender ID?

When SMS began, way back in 1992, the sender ID was set at 11 characters and has remained as the standard since then.

Back then, screen sizes were comparatively tiny, so it may not have been possible to fit more than 11 characters on all phone models.

Can the SMS sender ID contain a mixture of letters and numbers?

A sender ID can contain both letters and numbers. See below for an example SMS sender ID that contains both letters and numbers - Test1234. If numbers and letters are used, the maximum character limit is 11

Different countries and networks set their own rules on how much control they allow in setting the SMS sender ID.

Can the sender SMS sender ID be spoofed?

In many countries the sender ID can be set to whatever the sender wishes. This means that there is a danger that a fraudster could attempt to impersonate an organisation or individual.

There have been many illegal smishing campaigns that attempt to convince consumers to visit fake websites and enter their account details. (Smishing is similar to email phishing except the fraud is attempted over SMS.)

SMS smishing fraudsters will often use the sender ID to convince the recipient that the message is from a legitimate source.

Alarmingly if someone sends a text from a sender ID that is already a contact in your phone, rather than just displaying the digits of the number set, the person’s name will be displayed.

The message will also appear in the message thread, making it appear even more genuine.

Country restrictions on setting the SMS sender ID?

The ability to set the sender ID depends on which country you are sending to. In the UK, you have complete control over what you set it as. In many countries including the US, the networks do not permit you to send messages from a custom sender.

All messages must come from either a local long code (that looks like a normal mobile number) or from a short code.

If you attempt to send a message with a customised sender ID to a country or network that does not permit them, then the sender ID will usually be replaced with a local long code or the message may fail to be delivered.

Can I change the sender ID on a personal text?

The sender ID is automatically set to the mobile number of the person sending the message. If that mobile number is stored in the recipient's phone then the sender ID will be displayed as the contact name that was set when the contact was stored.

Do you need two-way SMS or one-way SMS

Before we get started, let’s cover off the two major differences when it comes to choosing a sender ID. These functionalities can make or break your decision, so it’s best to consider this first.

Two-way SMS

This feature means recipients can text you back to form a conversation – learn more about it here. It’s best used for:

• Appointment confirmations and reminders
• Customer service
• Employee communications
• SMS surveys
• Promotional offers (with a call-to-action)

One-way SMS

This means you can send an SMS, but you can’t receive one back. It suits the following use cases best:

• Promotional offers (without a call-to-action)
• Two-factor authentication
• Updates & alerts