01
Telecom mobile apps
Calling, second-number and business communications apps for iOS and Android. Clear journeys, thoughtful interfaces and the engineering behind every tap.
The telecom apps specialist
Serious telecom.Beautifullysimple apps.
We turn complex communications technology into products people love to use. Mobile apps, voice platforms, eSIMs and AI Assistants — thoughtfully built, from the interface to the network.
Global expertise. Global perspective.
Good connections start with people.Product thinking. Telecom engineering.
One specialist team.
Every layer of your product.
Mobile apps
Voice & numbers
eSIM connectivity
AI Assistants
01 / What we do
Everything it takes
to make the connection.
A great telecom product needs more than a good interface. We bring product design, app development and communications engineering together, so every part works as one.
02
Voice & numbering
Connect the app to the network. Number provisioning, SIP and WebRTC integration, call routing, IVR and voicemail-to-email, designed around your service.
03
AI voice experiences
AI Assistants that answer calls, take messages and guide callers to the right place. Natural conversations, useful transcripts and clear handover paths.
04
eSIM & mobile services
Make connectivity simple to buy and use. We integrate travel data plans, eSIM purchasing and activation journeys, mobile top-ups and service management.
05
Platforms & integrations
The systems that keep the service running: customer onboarding, identity checks, provisioning, payments, billing and the tools your operations team needs.
06
Product design & delivery
Turn a promising idea into a focused first release. We shape the scope, design the experience, test the details and support the product as it evolves.
02 / Product experience
We build for others.
We build for ourselves.
Our experience comes from building and running a telecom product of our own. That changes the way we approach yours.
SimBuster
A Tierra Digital productiOS & Android
Built and operated by our team
One app.
More ways to connect.
SimBuster brings phone numbers, calling, smart call routing, AI Assistants, travel eSIMs and mobile top-ups into one mobile experience.
We design, develop and operate the app, its voice infrastructure and the integrations behind it. That practical experience informs every project we take on.
Let’s talk about your productPractical experience, from customer onboarding to live call handling.Product design / Engineering / Operations
03 / How we work
A clear path.
A closely connected team.
Whether you’re starting a new service or improving an existing platform, we make the next step clear — and keep the people doing the work close to the conversation.
01
Understand
Get clear on your users, business model, network dependencies and the problem worth solving.
02
Shape
Define the experience, architecture and first release. Agree priorities, responsibilities and a realistic delivery plan.
03
Build
Design, develop and integrate in focused stages, with regular demonstrations and practical testing throughout.
04
Evolve
Support the launch, learn from real usage and improve the product around what customers actually need.
A focused project or an ongoing product partnership — shaped around your needs.
who understand the whole picture.
04 / Meet Tierra Digital
Telecom minds.
Product people.
We’re a Hong Kong company with a predominantly Global team of developers, telecom engineers and product specialists, working with an international outlook.
We understand what sits behind a simple phone call: the app, the network, the integrations and the customer experience. We bring those perspectives together to help you build a service that makes sense at every level.
Direct conversations with the people building your product
Commercial thinking alongside technical depth
Care for the details your customers will notice
Let’s make a connection
What shall we
build together?
A new telecom app. A smarter voice service. A better version of what you already have. Tell us what you have in mind, and we’ll explore the next step with you.
Our registered address
Tierra Digital Ltd.89, Lockhart Road, Unit 901 - 9th floor,
Wan chai building, Wan chai,
Hong Kong