Project: HandySIM

HandySIM is an international eSIM platform created for users who need fast, convenient, and flexible access to mobile internet while travelling across different countries worldwide. Through the platform, customers can choose an eSIM plan based on their destination, complete an online payment, and receive a digital connectivity solution without using a physical SIM card.

The project required the development of custom software combining a public website, an administration panel, API integrations with multiple eSIM providers, card payments, automated processes, and a multilingual structure.

A stable technical architecture was essential for this type of business, as the platform needed to manage a large volume of destinations across more than 190 countries, along with plans, providers, users, translations, and real-time transactions.

The main objective was to develop a scalable eSIM platform that automates a significant part of the processes related to selecting, purchasing, activating, topping up, and managing eSIM services.

Another important part of the project was the development of an administrative environment providing efficient control over content, providers, orders, data usage, language versions, and the affiliate programme.

What Did We Develop?

We developed a custom platform with international reach, serving users across different markets, connecting with multiple providers through APIs, and providing a clear journey from destination selection to eSIM delivery.

Key Features

The platform combines a public website, a responsive administration panel, API integrations, automated processes, card payments, AI translation, and logic for managing international content.

The system includes:

• selection of eSIM plans by country, region, or specific destination;
• the ability to purchase and top up an eSIM;
• online card payment integration;
• API integrations with multiple eSIM providers;
• automated processes related to plans, orders, and eSIM delivery;
• data usage tracking algorithms;
• integration with an automated AI translation system;
• a multilingual structure for international markets;
• an affiliate programme supporting loyalty and partner sales.

API Integrations and Process Automation

One of the most important parts of the project was the integration with multiple eSIM providers through APIs.

This allows the platform to work with different suppliers, plans, terms, and availability while reducing reliance on manual management.

For a service with international reach, this logic is particularly important. Users expect a fast and accurate process: they select a destination, review a suitable plan, pay online, and receive access to their eSIM.

To support this process, the system synchronises information across different providers, processes orders accurately, and maintains a stable connection between the public-facing platform, payment systems, and administration panel.

Automation reduces manual processing, lowers the risk of errors, and creates a more reliable experience for both end users and the team managing the platform.

How Did We Support the Business?

The development of the platform provided HandySIM with the technological foundation for an international eSIM service capable of operating across multiple markets, providers, languages, and user scenarios.

The solution enabled the business to automate key processes, reduce its dependence on manual work, create a faster customer journey, and establish a more stable foundation for partner sales through affiliate functionality.

Technologies Used

The project was developed using:

• PHP;
• HTML5;
• CSS3;
• SASS;
• JavaScript;
• jQuery;
• responsive UI;
• a custom administration panel;
• API integrations with eSIM providers;
• card payment integration;
• AI translation;
• geolocation logic;
• affiliate functionality;
• data usage tracking algorithms.

The technical architecture was designed with a focus on stability, automation, API connectivity, international scalability, and convenient operation for both users and the team managing the platform.

The Result

Through this development by the WEBiDEI team, HandySIM received a complete digital platform for selling, managing, and topping up electronic eSIM plans.

The system combines the customer journey, API integrations, online payments, automated processes, multilingual support, geolocation, AI translation, and administrative control within one stable working environment.

The solution gave HandySIM the technical foundation required to develop a scalable international business model.

Users can quickly select and purchase an eSIM plan, while the team benefits from improved organisation, automated processes, and greater flexibility when expanding into new markets.