Understanding SMS Sender IDs: Alphanumeric, Numeric, and Shortcodes

The Sender ID is what your recipients see instead of a phone number. Getting it right affects both deliverability and brand recognition.

Types of Sender IDs

Alphanumeric Sender ID

A custom text string up to 11 characters — typically your brand name (e.g. SMSPM, MyStore). Recipients cannot reply, but they see your brand name immediately.

Best for: Marketing messages, notifications, alerts.

Numeric Sender ID

A standard phone number. Recipients can reply, and it is accepted in countries that block alphanumeric senders.

Best for: Two-way communication, markets with restrictions.

Shortcode

A 5-6 digit number, typically shared or dedicated. High throughput, widely supported, but requires carrier approval and comes at higher cost.

Best for: High-volume campaigns, OTPs, regulated industries.

Countries That Require Pre-Registration

Some countries mandate that alphanumeric sender IDs be pre-registered with local carriers before use. Key examples:

• India — TRAI regulations require DLT registration
• United States — Alphanumeric senders are not supported; 10DLC or shortcodes required
• Australia — Sender ID registration via carriers
• Indonesia, Vietnam, Thailand — Pre-registration required

SMSPM handles sender ID registration for supported markets. Contact support to initiate the process.

How to Apply for a Sender ID in SMSPM

1. Log in and go to Settings > Sender IDs
2. Click Request New Sender ID
3. Enter your desired name and intended use case
4. Our team reviews and activates it, typically within 1-3 business days

Once approved, your sender ID is available in the SMS composer.