The single most common reason a business stays on a phone system it has outgrown is not cost. It is the fear that somewhere in the changeover, the number printed on fifteen years of vans, invoices and Google listings will stop ringing.
It is a reasonable fear. It is also almost entirely avoidable, and it helps to know what actually happens.
What porting is
Your phone number does not belong to your phone system. It belongs to you, and it is currently hosted by whichever carrier you pay. Porting is the process of telling the industry’s shared database that a different carrier now answers for that number. The number itself never changes.
This is a legal right, not a favor. In the United States your current provider cannot refuse to release a number you are entitled to, and cannot hold it hostage because you owe them money or are mid-contract. They can bill you for the contract. They cannot keep the number.
What actually happens, step by step
You sign a letter of authorization
One form, giving the new carrier permission to act for you. It has to match your current account exactly — the same business name, the same service address, the same account number. This is where most delays start.
The request goes to your current carrier
They check the details against their records and either accept the request or reject it. A rejection is almost never a refusal; it is nearly always a mismatch. The address on file says “Suite 107” and the form says “Ste 107”. The business name is the trading name rather than the registered one. The account number was transcribed from a bill with a smudge in it.
Each rejection costs a few days. This is why we ask for a recent bill rather than what you remember the details being.
A date is agreed
Once accepted, the carriers agree a firm date and time for the switch. Typically one to three weeks out, sometimes longer for a large block of numbers or a legacy PRI circuit.
The new system is built while the old one runs
This is the part people do not expect. Everything — handsets, call flows, voicemail, after-hours routing — is built and tested on the new system while your old one is still taking every call. Nothing is unplugged. If the new build is not right, we have weeks to fix it, not minutes.
The number moves
On the agreed date, usually in the evening or early morning, the number switches to the new carrier. The switch itself takes minutes. We test inbound and outbound on every number before anyone goes home.
The old system stays as a fallback
We leave the previous system live and reachable for a short period afterwards. If something unexpected turns up on the first busy Monday, there is somewhere to fall back to. It gets decommissioned once the new one has proven itself, not before.
The things that go wrong, and how to avoid them
- Cancelling your old service first. Do not. A cancelled number is a released number, and once it has gone back into the pool, getting it back ranges from difficult to impossible. Cancel after the port completes — we will tell you when.
- Details that do not match. Give the installer a copy of a recent bill. Not the details from memory, and not last year’s.
- Forgetting a number. The main line is never the problem. It is the fax line nobody uses but the bank has on file, the direct dial for the manager who left, the toll-free number on an old brochure. Make the list from the bill, not from what people remember.
- Assuming everything ports. Most numbers do. Some, particularly in remote areas or on certain legacy circuits, are tied to a geographic area a new carrier does not serve. That is worth checking at the quote stage, which is why we check it before you commit to anything.
How long to allow
For a small business with a handful of numbers on a single carrier, two to three weeks from signed form to completed port is normal. For multi-site businesses, several carriers, or anything on a PRI, allow six to eight. Nothing about that time is us being slow — most of it is the receiving and releasing carriers working through a regulated process.
Build it into the plan and it is uneventful. Discover it the week you wanted to move offices and it is not.
The short version
Your numbers come with you. It takes a few weeks, it needs a copy of your bill, and the one thing you must not do is cancel anything until the port has finished. In forty-plus years of doing this, the numbers that got lost were the ones someone cancelled early.
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