End the legacy stack. Keep every subscriber.
End the legacy stack.
Keep every subscriber.
Move from legacy constraints to a modern operating model — without a multi-year, services-heavy transformation project. Structured and repeatable, not experimental. Nothing moves until a dry run has already proven the result.
What actually goes wrong
“Migration risk stops my decision.”
The objection of every CTO, CIO and anyone who has lived through a failed transformation. The risk is real, and it is specific. Five things go wrong in migrations, and every one of them can be closed before cutover.
Subscribers feel it
Churn spikes
A migration the customer notices — a failed activation, a SIM that has to be swapped, an app that stops working — is a reason to leave. When the move also changes network and every subscriber needs a new SIM, the industry standard is around 20% churn.
Billing arrives wrong
Revenue leaks
Balances reset, invoice runs duplicate, subscribers mid-dunning are quietly released. Every error is a credit note, a dispute, or revenue that is never invoiced at all.
Numbers and porting break
Compliance exposure
Number ranges, donor records and porting history are the least documented part of any legacy stack — and the part a regulator asks about first when ports start failing.
Nobody knows what is in the base
Discovered late
Grandfathered tariffs, orphaned SIMs, one-off exceptions agreed years ago. Unmapped, they surface mid-flight, at the most expensive possible moment.
The project outlives its business case
Cost drifts
A cutover set as a date rather than a condition pushes every unresolved issue forward. Two years and a services bill later, the operator is running two stacks instead of one.
- On migrations that require SIM swaps, against an industry assumption of around 20%.
- < 3.5% churn
- Migrated in under six weeks. A delivery that has already happened, not a benchmark.
- 11 brands
- Live and migrated across markets, networks and setups. Repeatable, not experimental.
- 20+ operators
Your customers move safely in batches.
A cutover is not a single event. The base is divided into batches, and the legacy stack keeps carrying every subscriber that has not moved yet — so there is never a moment where the operator is running on hope.
- Product offers — moved from Legacy product catalog
- Users — moved from Spreadsheet CRM
- Subscriptions — moved from Manual plan management
- Billing & payments — moved from Legacy billing suite
- 3rd party integrations — moved from Hand-built middleware
- Inventory (eSIM, SIM, numbers) — moved from Vendor SIM and number registries
The base moves in 10 batches of 100,000 subscribers; a batch is only live once it reconciles against the legacy stack.
Nothing cuts over unverified
A batch counts as migrated once it reconciles against the legacy stack — balances, tariffs, provisioning state. Until then the legacy stack is still authoritative for those subscribers, so a mismatch stops the sequence, not the business.
Sized to your risk appetite
You choose batch size and pace. Start with a small, low-complexity batch, then accelerate once the first ones land the way the plan said they would.
Use the move to get lighter.
A migration is the one moment you can decide what not to bring. Mapping is where legacy clutter gets left behind rather than copied forward, so what arrives in Seamless OS is the estate you want to operate — not the one you inherited.
The catalog
Dead tariffs and duplicate offers are retired on the way in. Grandfathered plans stay, closed rather than copied.
The systems
Six sources become one platform. Hand-built middleware and spreadsheet workarounds are switched off, not migrated.
The inventory
Orphaned SIMs and inactive profiles surface during profiling, so you stop carrying records nobody could account for.
What clean means in practice
Three mechanisms replace the assurances: a strategy that already exists, one person who owns the outcome, and a live view of both.
A proven mapping and transfer strategy
The data mapping, the conversion buckets, the loading engine and the validation steps come from migrations that have already run — applied to your estate, not invented for it.
A dedicated Technical Account Manager
One named person is your technical lead and success partner through delivery and after go-live: a single point of contact for delivery, operations and escalations, with a direct feedback loop into product and engineering.
A collaboration hub, live
Tasks, milestones, documentation and a shared timeline sit in one hub with real-time updates, structured meeting notes and tracked feedback. Recurring meetings keep both sides aligned on next steps — nobody waits for a monthly steering deck.
Done this way, migration stops being a decision about risk. It becomes a date.
You're one clean migration away from success.
Today
On the legacy stack
The migration
Weeks, not years
Back into growth & speed
Day one on Seamless OS