End the legacy stack. Keep every subscriber.
End the legacy stack.
Keep every subscriber.
Leave legacy behind without a multi-year transformation program. Your customers, data and brand stay put — only the stack underneath changes. You’re not just replacing legacy — you’re upgrading beyond it.
Your customers move safely in batches.
- 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.
Why the decision stalls
“Migration risk stops my decision.”
Ask any CTO who has lived through a failed transformation. The risk is real — and finite: five known failure modes, all closable before cutover.
Subscribers feel itChurn 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 wrongRevenue 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 breakCompliance 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 baseDiscovered 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 caseCost 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
What clean means in practice
A proven migration method
Mapping, conversion, loading, validation — the same method we have already run, applied to your estate. Your migration is not an experiment.
A dedicated Delivery Lead
Your technical and success partner: a dedicated Delivery Lead owns the full delivery and migration, with a direct line into product and engineering.
A shared collaboration hub
Tasks, milestones, docs, timeline and meeting notes live in one place, updated as work happens. Recurring meetings keep both sides moving.
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