The cheapest clean way to add a second phone line for business is a cloud business number that rings in an app on the phone you already own. It costs $9 to $17 a month for one person, needs no new SIM, keeps your personal number private, and can send business texts once carrier registration is approved. The other routes work, but each one breaks somewhere.
Owners usually search this after the same moment: a customer got your personal cell from a text thread, and now the same phone that holds family photos also takes quote requests at 9 PM. A second line fixes that. Below are the four real options, the monthly cost of each, and the point where each one stops being enough.
The four ways to get a second business line
| Route | Typical monthly cost | Business texting | Phone menu and routing | Where it breaks |
|---|---|---|---|---|
| Cloud business number in an app | $9 to $17 per user billed yearly on Phoner, $15 to $23 on competitors | Yes, after carrier registration | Yes | Needs data or Wi-Fi, so a dead zone means voicemail |
| Google Voice | Free personal, $10 to $20 per user paid | Not on the free tier | Basic | No shared inbox, local numbers only |
| Dual SIM or eSIM from a carrier | $15 to $40 for a second plan | Personal texting only | No | One person, no team, no menu |
| Second physical phone | $150 to $800 once plus a plan | Personal texting only | No | You carry two phones and a lost one is a lost number |
Second phone line for business on iPhone
An iPhone can hold two lines at once with dual SIM or eSIM, so a carrier line is possible. The catch is that a carrier line is still a consumer line. It has no phone menu, no way to ring a second person, and texting from it is treated as personal traffic. For most owners the better iPhone setup is a business number in an app, which shows up as its own line in the Phone and Messages experience of that app while your personal number stays untouched. Our business phone app page shows what that looks like in practice.
Second phone line for business on Android
Android is the same story with one advantage: many models ship with dual SIM slots. That makes a carrier second line easy to add, and it still lacks routing, a menu and a team inbox. If you are the only person who will ever answer and you do not need texting, a carrier line is fine. The moment a partner, a bookkeeper or a crew lead needs to pick up too, a virtual phone number is the cleaner answer because anyone you invite can answer as the company number from their own phone.
What a second line costs for two people
Take an owner and one employee who both answer the line and want a phone menu and texting. On Phoner Team that is two seats at $17, so $34 a month and $408 a year, billed yearly. The same two seats on OpenPhone or Dialpad run roughly $30 to $54 a month depending on tier and billing term. A carrier second line costs $15 to $40 each, so two lines cost about the same and give you neither a menu nor a shared inbox. You can see current Phoner rates on the pricing page, and you should confirm any competitor figure on that vendor's own page before you buy.
Keep your texting legal
If the second line will send customer texts, the number needs to be registered for business messaging. US carriers require A2P 10DLC registration for business texts, and unregistered traffic gets filtered. The Federal Communications Commission explains the consent rules for texting customers in its guide to unwanted calls and texts. A paid cloud number handles the registration for you, which is one reason a free personal line is a poor fit for a business.
How to set up a second business line in an afternoon
- Pick the number. A local number suits a service area, a toll-free number suits a business that sells beyond one city. Our guide to getting a business phone number covers the choice.
- Decide whether to port. If customers already know a number, move it in. Porting is free and takes one to two weeks, and the old number keeps ringing meanwhile.
- Record a greeting. Name the company, not you.
- Set hours. Business hours ring your phone, after hours go to voicemail with a text transcript.
- Invite the second person. They install the app and answer as the company number.
A worked example, an owner and a bookkeeper
A two person design-build shop gives out the owner's cell on every estimate. Customers text at 10 PM, the bookkeeper cannot see any of it, and when the owner changes phones the number goes with the old handset. After moving to a cloud line, the shop keeps the old number by porting it, adds a menu with one option for new estimates and one for billing, and invites the bookkeeper as a second seat. The bill is $34 a month on Team billed yearly. Missed calls now arrive as transcribed voicemail in a shared inbox, so a 10 PM request is answered at 7 AM with a text instead of a guess about which message was important. Nothing about the owner's personal number changed.
Three mistakes that make a second line useless
- Giving out the new number but still answering from the old one. Calls out must show the business number, so check that the app makes outgoing calls as the company line by default.
- Skipping the greeting. A default robot voice makes a new line feel like a spam number. Record your own company name in ten seconds.
- Forgetting the backup. Cloud numbers need data or Wi-Fi. Set the fallback so an unreachable app rolls to your cell or voicemail instead of ringing out.
Which route fits which owner
- Solo, never texting customers: a dual SIM carrier line is enough.
- Solo, texting customers or planning to hire: a cloud business number now, so the number never has to change.
- Two or more people answering: a cloud business number with a phone menu and ring order, and nothing else is close.
- Mostly mobile, patchy coverage: a cloud number with a mobile fallback to your cell, or a carrier line as a backup.
Owners who run a crew often start by comparing the field in our ranking of the best second phone number app for business. If you would rather see a provider that also sells phone service for companies, Youvoip is another one to read before you decide.
Frequently asked questions
Can I add a second phone line to my iPhone without a new SIM?
Yes. Install a business phone app and claim a number inside it. The number rings in the app on your existing iPhone, calls go out as that number, and your personal number never appears. No SIM, eSIM or second device is needed, and setup takes about ten minutes.
How much does a second phone line for business cost?
A cloud business number costs $9 to $17 per user per month on Phoner billed yearly, and $15 to $23 on competing apps. A carrier second line costs $15 to $40 a month. Google Voice is free for personal use and $10 to $20 per user a month on business plans.
Can two people answer the same second business line?
Yes, with a cloud business number. You set a ring order or ring both phones at once, and whoever picks up answers as the company. Carrier second lines and a second physical phone cannot share a line between people.
Is a second line the same as a second number?
For a small business, yes. A second line is a second number that rings on your phone. A true extra line in a phone system usually means a number plus a seat, so the cost per person is the figure to compare.
Line open
Get your business number
Phoner is a business phone system with virtual phone number built in: a local or toll-free number your whole team can answer, with an IVR menu, voicemail-to-text, and routing from $9 per user per month billed yearly. No hardware, no contracts.