SMS or voice? Learn when to text, when to call, and how to combine both channels for maximum customer engagement with a practical decision framework.
SMS vs Voice for Business: How to Choose the Right Channel in Africa (2026) Read More »
USSD is a communication technology used by mobile devices to interact with network services. Unlike SMS, which operates using a store-and-forward method, USSD establishes a real-time connection between the user and the service provider. When someone dials a code like *123#, it opens an instant session where they can navigate menus, check balances, buy airtime,
5 Ways to Stop Unauthorized USSD Access in 2025 Read More »
Choosing the best bulk SMS service in South Africa comes down to one question: what are you actually sending? Marketing campaigns, transactional OTPs, and automated alerts each reward different strengths, so the right provider depends on your use case, not on a single “winner.” Here is the short version. For reliable sending at scale across
Best Bulk SMS Services in South Africa: 2026 Buyer’s Guide Read More »
When searching for free bulk SMS in South Africa, people often expect unlimited messaging at zero cost. The reality is different. Completely free, unlimited bulk SMS services are almost nonexistent. Every SMS you send travels through mobile network operators like MTN, Vodacom, Cell C, or Telkom, and these operators charge fees for this service. SMS service providers
Free Bulk SMS in South Africa: What You Need to Know Read More »
According to the GSMA, a global association representing over 750 mobile operators and nearly 400 companies across the mobile ecosystem, more than 850 million people in Sub-Saharan Africa use mobile phones. USSD remains the primary digital access channel for over half of them, particularly in areas with limited internet connectivity. USSD in Cybersecurity fortifies online
USSD Cybersecurity Risks: Threats & Protection Guide Read More »
Designing user authentication flows is essential to ensuring that only the right people access an app. Verification methods have become more crucial with increased data breaches and security challenges. One-time passwords (OTPs) have emerged as a reliable way to enhance security by adding an extra layer of protection beyond traditional passwords. Authentication confirms a user’s
OTP User Authentication: Design Effective Login Flows Read More »
OTP security best practices for developers: map each OTP attack to its defense, harden delivery and server-side validation, ship verification that holds.
OTP Security Best Practices: A Developer’s Guide to Secure Transactions (2026) Read More »
You’ve wired up the Arkesel OTP API endpoint. You fire off your first request. Instead of a delivered OTP, you get this: { "code": "1004", "message": "SMS gateway not active or credential not found" } Now what? This OTP API integration troubleshooting guide maps every Arkesel OTP API error code to its root cause, shows
OTP API Errors: 10 Common Issues and How to Fix Them (2026) Read More »
One question businesses often ask is this: Are USSD codes safe? Security is of the utmost importance in any service that involves consumer data, and USSD, a vital technology for connecting service providers and mobile devices, is no exception. Due to its use of sensitive client data, USSD services are potential targets for security breaches.Â
Are USSD Codes Safe? Understanding USSD Security Read More »
You need to send SMS from your application — OTP codes, order confirmations, marketing campaigns. The Arkesel SMS API lets you do it with a single HTTP request. No SDK required. Just standard REST from any language. This guide walks you through authentication, sending your first SMS via the Arkesel API, handling errors, and scaling
How to Send SMS via the Arkesel API: Developer Guide with Code Examples Read More »
