Numbers, Porting & Regulatory
Number Porting
By Myroslav Orshak · operates licensed carrier infrastructure · Updated September 2026
Number porting is the process of moving an existing phone number from one provider to another, keeping the same number — a right US law guarantees you, which your current provider cannot refuse.
How it works
You never ask your old provider to release the number — that's the mistake that starts most porting horror stories. You place the order with your NEW provider, who submits the request on your behalf. Behind the scenes, the two carriers coordinate through a shared national database that tells the entire phone network where to send calls for your number. When the switch flips, calls stop arriving at the old provider and start arriving at the new one, usually within a few minutes.
To submit, the new provider needs four things that must match your old account exactly. They are the account number, the PIN or passcode on that account, the service address as the old carrier has it, and the name of an authorized person. That matching requirement is the whole game — the overwhelming majority of rejected ports are paperwork mismatches, not technical problems. Pull a recent bill and copy the details from it rather than from memory.
Then the single most important rule: do not cancel your old service. Canceling before the port completes releases the number back into the pool, and at that point it is gone — not delayed, gone. The old account closes automatically once the port lands.
Why it matters
Your phone number is on your trucks, your signage, your Google listing, and in the phones of every customer you've ever served. Porting is what makes switching providers a pricing decision rather than a marketing catastrophe — it's the reason a business can leave an overpriced carrier without losing a decade of word-of-mouth.
It's also the step where switches go wrong. Handled well — order placed, paperwork matched, old service left running, cutover scheduled for a quiet morning — the office never misses a call. Handled casually, a business can lose inbound calls for days during the transition.
FCC rules require simple ports (a single number with matching records) to complete within one business day, and your current provider cannot refuse a valid request, even if you owe it money. Some providers do charge a porting fee. Multi-line business ports fall outside the one-day rule and typically take two to four weeks.
Related terms
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Compare providers that handle porting well →Frequently asked questions
What do I need to port my business number?
Four things, copied exactly from a recent bill: your account number, the account PIN or passcode, the service address on file, and an authorized name on the account. Most providers also want a signed authorization form (a 'letter of agency') and a copy of that bill. Get these from the bill itself — details typed from memory are the top cause of rejections.
How long does porting take?
A single number with clean records: one to three business days, with FCC rules requiring one business day for simple ports. A multi-line office system: typically two to four weeks, because the carriers coordinate a scheduled cutover for the whole group. Numbers bundled with an internet or TV contract take longest, since the bundle often has to be unwound first.
Can my current provider refuse to release my number?
No. Federal rules forbid refusing a valid port request, and they can't hold your number hostage over an unpaid balance — you'll still owe the bill, but the number moves. What they can do is reject a request whose details don't match their records, which is why exact paperwork matters. If a provider stalls a valid request, the FCC takes complaints.
Will my phones stop working during the port?
They shouldn't. Keep the old service active through the transition; on cutover day, calls simply start arriving at the new system. The interruption, if any, is minutes. Schedule the cutover for a quiet morning rather than a Friday afternoon, and have staff ready to confirm calls are landing.
Can I port a number to a mobile phone or from a landline?
Yes, in nearly every direction: landline to VoIP, VoIP to mobile, mobile to VoIP. The main restriction is geography — a number can generally only port to a provider that serves the local area it belongs to. If you're moving cities and want to keep the number, a VoIP service is the way, since it isn't tied to a wire at an address.
Does porting cost anything?
FCC rules let providers charge a porting fee, and some do, on either side; many business services now port numbers for free. What your old provider cannot do is refuse the port, even if you owe it money. Large multi-line moves occasionally carry a project fee, so ask for the all-in cost in writing before signing.