Sending A2P SMS in Kenya requires mandatory pre-registration of Sender IDs via carriers, a requirement driven by the approval process of market leader Safaricom, which holds over 60% of the mobile subscriber share.
In 2026, the three major operators — Safaricom, Airtel Kenya and Telkom Kenya — launched a unified registry, requiring enterprises to submit documents including KRA PIN, certificate of incorporation, sample message templates and use case descriptions. Enterprises cannot register Sender IDs directly with operators; all applications must be submitted on their behalf by Content Service Providers (CSPs) authorized by the Communications Authority of Kenya (CA). Sender IDs are limited to 11 characters, with no spaces allowed; hyphens and underscores are permitted. Generic terms such as “INFO” or “ALERT” will be rejected, and the ID must clearly represent the brand.
Kenyan operators apply clearly differentiated treatment to transactional and promotional traffic. Alphanumeric brand Sender IDs are generally restricted to transactional messages only, while promotional messages mostly use numeric short codes. The two types of traffic cannot share the same Sender ID and require separate application and approval.
Safaricom’s approval process follows a fixed schedule: applications are submitted on Mondays and Thursdays, and results are typically returned on Tuesdays and Fridays. Airtel and Telkom Kenya have longer approval timelines, taking 7 to 14 business days. Regarding registration fees, Safaricom and Airtel charge a one-time registration fee of approximately KES 8,700 (tax inclusive). The entire registration process takes approximately 4 to 8 weeks. Unregistered Sender IDs will be silently dropped or replaced with random short codes.
