Number porting to the cloud: the practical guide to keeping every call

Your business number is on the company vans, the signage, the business cards, the Google Business listing, every employee’s email signature, and every invoice you’ve issued for a decade. Then comes the moment you want to change providers or move to the cloud - and the first question in the room is always the same one: “but what happens to the number?”

Number porting is the answer. It’s the regulated process of moving an existing number from one provider to another without changing a digit - in Israel, number portability is mandated by Ministry of Communications regulation and covers both mobile and fixed-line numbers. Put simply: the number follows the subscriber, not the provider. And the hard part of porting is almost never technical - it’s paperwork and timing, both of which are entirely preventable.

Quick takeaways

• The idea: porting moves an existing number to a new provider unchanged. The right to port is regulated, and the number belongs to your business - not to a vendor.
• How it flows: you open the request with the new provider, submit documents that match the existing registration exactly, a cutover date is set - and the number starts routing to its new home.
• Why it matters: move to the cloud without losing calls, reprinting signage, or telling long-time customers you have a new number.
• The requirement: accurate subscriber details, a planned overlap between old and new - and never canceling the existing service before the port completes.

How porting actually works - five steps

1. Get the full picture first. Which numbers do you actually have? Most businesses discover forgotten ones at this stage - a fax line, a closed branch, a campaign number from years back. Pull the list from your current provider’s latest invoice and decide what moves, what closes and what simply gets forwarded.
2. Open the request with the new provider. That’s the right direction - you don’t call the old provider to ask permission. The gaining provider submits and manages the request with the losing one.
3. Match subscriber details exactly. This is where most requests fail. Company name, registration number and account number must match the current provider’s records precisely - not the trading name, not the name after a merger, not the one that’s convenient. One mismatched document means a rejected request and another round trip.
4. Set a date and build the flow first. Before the number moves, everything that will receive it must already exist on the new side: call routing, the auto attendant, extensions, queues and greetings. Porting is the last step, not the first.
5. Watch the first hours. On cutover day, test from every direction - mobile, landline, an outside caller - and confirm outbound calls present the right caller ID too. Only once everything is stable do you close the old service.

Four mistakes that cost real money

• Canceling the old provider too early. The moment service is canceled the number is released back to the pool - and it isn’t necessarily yours anymore. Cancel only after the port is complete and verified.
• Submitting details that are “close enough.” A mismatch between the request and the existing registration is the number-one cause of delays. A current invoice from your provider settles it in a minute.
• Porting before the system is built. A number landing on an empty PBX rings nowhere. Build first, port second.
• Forgetting what else depends on the line. Card terminals, alarm systems, SMS verification services and fax numbers sometimes sit on the same lines. Walk that list before the move, not after.

Moving without a minute of silence

The trick is an overlap, not a switch. During the transition both worlds run in parallel: the new provider is live and staffed, the old one is still active - so no call falls between them.

• Start with a new number alongside the old one. Provision a fresh virtual number in the cloud, run the new system on it and test against real traffic - before touching your main line at all.
• Port in waves. A secondary number or one department’s line first; the main number only once that runs clean. If your main number effectively is your business, it shouldn’t be the first thing you move.
• Keep the old line alive for a safety period. One extra month with the old provider costs far less than one lost call.
• Update your digital presence on cutover day. Website, Google Business, email signatures and ads - so the number showing outside is the one answering inside. If you’re also weighing an additional number of a different kind, our number types overview and guide to choosing business numbers sort out the options, and the map of Israeli area codes explains what each prefix means today.

How this looks with us

Porting isn’t a form we send you to fill in - it’s part of the deployment. Our migration team builds the porting plan end to end: mapping the existing numbers, filing requests with the losing provider, coordinating dates and training the team - with the new system already standing and ready. PBX.IM, our cloud PBX, goes live in hours to a few days and receives ported numbers straight into extensions, queues and an auto attendant - no server, no technician. And when you need extra numbers alongside the ported ones, DIDHub supplies local, national and toll-free numbers across 130+ countries with instant activation - exactly what the overlap period calls for. All of it on infrastructure certified to ISO/IEC 27001.

Got a number that’s been with the business for years and want to take it to the cloud without risk? Talk to us - we’ll map your existing numbers, build a staged porting plan and stay with you through the first call on the new system.