I need a cross-platform telecom application for iOS and Android that combines mobile top-ups, SIM card sales, internet bundles, and future product sales in one simple customer journey. The first priority is the top-up module. It should include payment gateway integration (Stripe or equivalent), transaction history, push notifications, and direct integration with a telecom top-up API so order status updates immediately after purchase. The app should also support SIM card and internet bundle sales, where users can browse, place orders, pay securely, and receive either digital delivery or shipping confirmation depending on the product type. An admin dashboard is also required for managing products, orders, users, and API-based services. I am only interested in developers or teams with proven experience in telecom, recharge, fintech, or similar transaction-based applications. Please include: - Relevant portfolio or screenshots - Suggested tech stack - Estimated timeline - Cost estimate by milestones - Post-launch support details Please provide your cost estimate based on the requirements. Budget is open and will be discussed based on experience and quality.