Check the notice period, port the numbers, and cancel the old account only after calls arrive.
The notice period on the current contract sets the date you can leave.
Leave the old account open until calls land on the new service.
Each range below is the published premium price, widened by that vendor's confidence band. State tax is not included, because it depends on where you are. Prices as published by each provider. Data as of 2026-10-04.
A TechEstimate is a range. A written proposal is the number you can hold a provider to.
These phone systems are alphabetical. This is not a quality ranking.
TechlyScore ranks them for your setup when you compare in real time.
123NET: $21 to $39 per user/month. 8x8: $26 to $30 per user/month. Aircall: $35 to $45 per user/month. AireSpring: $24 to $46 per user/month. Allworx (Windstream): $18 to $32 per user/month. AT&T Office@Hand: $26 to $34 per user/month. Avaya Cloud Office: $22 to $28 per user/month. BCM One: $19 to $35 per user/month.
More providers are in the same table. The list stays alphabetical.
The first invoice can add fees that the ad price skipped.
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Check your notice period first, because that is what decides your timing. Then order the new service, port the numbers, and only cancel the old account once calls are arriving correctly.
Yes. Number portability is a legal right. The one way to lose it is to cancel the old service before the port completes, which releases the number.
Nothing until the port is done. Telling them early can start a cancellation that releases your number before the new service is ready. Check your notice period in the contract instead.
Thirty to ninety days is common, and many contracts renew automatically if you miss the window. Find the notice period in your agreement and work backwards from your renewal date.
You can port it to a mobile carrier, but you lose the business routing that sits around it. Pointing the business number at a mobile through your phone system is usually the better option.
Related: how-to-port-a-business-phone-number, business-phone-system-with-texting, business-phone-system-with-auto-attendant. Glossary: voip, pbx. How to buy.
Data as of 2026-10-04.