Custom Sender
Send SMS with custom alphanumeric or numeric sender IDs in 200+ countries. Display your brand name or a local number as the sender. Country-specific registration handled by Callr.
Overview
Custom Sender IDs let you replace the default sending number with your brand name (e.g., "CALLR") or a specific local number. This improves message recognition and trust. Callr handles the registration and compliance requirements per country.
Sender ID Types
Alphanumeric: up to 11 characters displaying your brand name. Recipients cannot reply to alphanumeric senders. Numeric: a phone number (local or international) that recipients can reply to. The choice depends on country regulations and whether you need two-way messaging.
Country Coverage
Alphanumeric sender IDs are supported in 200+ countries, though regulations vary. Some countries require pre-registration. Callr manages the registration process and advises on per-country restrictions.
Others features
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