How to Set Up a Second Number on Your iPhone or Android

You want a second phone number. Maybe for your business. Maybe to stop giving clients your personal cell. Maybe because you realized — probably too late — that putting your real number on your website was a mistake.

Whatever the reason, you have options. More options than you probably realize. The trick is figuring out which one actually fits your situation, because they're not all created equal.

Here's every way to get a second number on the phone you already carry, with honest pros and cons for each.

Option 1: eSIM / Dual SIM

Most modern iPhones (XS and newer) and many Android phones support eSIM, which lets you add a second cellular line without a physical SIM card. Some Android phones also have dual physical SIM slots.

You'd get a second number through a carrier — either your existing one or a different one — and your phone would handle both lines natively.

How to set it up

• iPhone: Go to Settings > Cellular > Add Cellular Plan. Scan the QR code from your carrier or choose from available plans.
• Android: Go to Settings > Network & Internet > SIMs > Add SIM. Follow the prompts for your carrier's eSIM plan.

Pros

• It's a real second phone line with its own number
• Calls and texts work natively through the built-in dialer and messages app
• No extra app needed
• Works without WiFi — it's a true cellular connection

Cons

• It costs $30-60/month for a second line, depending on carrier and plan
• No business hours — both lines ring all the time, day and night
• No auto-reply for after hours
• No voicemail transcription (you get standard carrier voicemail)
• No way to share the line with a teammate or employee
• You're managing two separate phone plans
• No call routing, no professional greeting, no business features at all

Best for

People who want complete cellular separation and don't mind paying for a full second plan. If you just want two numbers and don't need any business features, this works — but it's the most expensive option by a wide margin.

Option 2: Google Voice

Google Voice gives you a free phone number that can make and receive calls and texts through the Google Voice app. It routes through your Google account and works over WiFi or data.

How to set it up

1. Go to voice.google.com on your computer or phone
2. Sign in with your Google account
3. Pick a number from the available options in your area
4. Link it to your existing phone number for call forwarding
5. Download the Google Voice app on iPhone or Android

Pros

• It's free for personal use (the business tier starts at $10/month)
• You can make calls and send texts from a separate number
• Voicemail transcription is included
• Works on any device with the app installed
• You can screen calls before answering

Cons

• No business hours — you can send calls to voicemail manually via Do Not Disturb, but there's no automatic schedule
• No auto-reply — if someone texts after hours, they get silence until you respond
• Limited number availability — you might not get your preferred area code
• The free tier is barebones — no team features, no shared number
• Google could discontinue it (they've killed plenty of products before)
• No toll-free number option on the free plan
• Text message support can be inconsistent with short codes and some services
• MMS and group messaging support is limited

Best for

Someone who needs a free second number for light use and doesn't care about business features. It's a fine option if you get a handful of business calls a week and just want to keep them separate from personal. But it doesn't scale, and it doesn't give you boundaries — it just gives you a second number.

Option 3: Carrier Add-On Line

Some carriers offer add-on lines or number-sharing plans. The specifics vary by carrier, but the general idea is adding a second number to your existing account for a monthly fee.

How to set it up

• Contact your carrier (Verizon, AT&T, T-Mobile, etc.) and ask about adding a second line or number
• Depending on the carrier, this might be a full second line or a "NumberShare" type feature
• Setup usually happens through the carrier's app or website, or in-store

Pros

• Managed through your existing carrier account — one bill
• Uses the carrier's native network

Cons

• $15-50/month depending on carrier and plan type
• Typically no business features (no business hours, no auto-reply)
• Some "number share" plans only duplicate your number to another device — they don't give you a second number at all
• Features vary wildly between carriers with little transparency
• You're locked into that carrier
• No team sharing or call routing

Best for

Honestly, very few people. Carrier add-on lines sit in an awkward middle ground — more expensive than free options, fewer features than business phone apps. Unless your carrier offers something genuinely unique, there's usually a better choice.

Option 4: A Dedicated Business Phone App

Business phone apps like Reach give you a real local or toll-free number on your existing phone, with features specifically built for running a business from your cell.

How to set it up (using Reach as an example)

1. Download Reach from the App Store or Google Play
2. Sign up and choose your business number — local or toll-free
3. Set your business hours (when you're available vs. when you're off)
4. Record a professional voicemail greeting
5. Turn on auto-reply so after-hours texts get an automatic response
6. Start using your new number for all business communication

The whole process takes about two minutes.

Pros

• Business hours — your business line rings during work hours and goes to voicemail after hours, automatically
• Auto-reply — clients who text after hours get an instant reply letting them know when you'll be back
• Voicemail transcription — read your voicemails instead of listening to them
• Professional greeting — callers hear a real business greeting, not "hey, leave a message"
• Team sharing — share your business number with a partner or employee so they can answer calls and texts too
• One phone — no second device, no second SIM, no second carrier plan
• Separate notifications — you always know if an incoming call or text is business or personal
• The off switch — silence your business line at 5pm and your personal phone keeps working normally

Cons

• Monthly subscription cost (though significantly less than a second carrier line)
• Calls use VoIP over data/WiFi, not the cellular network directly
• Requires a smartphone with a data connection

Best for

Anyone running a business from their phone who wants real separation between work and personal — not just a second number, but actual boundaries. If you want to stop working at 6pm and know that clients are still taken care of, this is the option that makes that possible.

Quick Comparison

| Feature | eSIM/Dual SIM | Google Voice | Carrier Add-On | Business Phone App | |---|---|---|---|---| | Monthly cost | $30-60 | Free (basic) | $15-50 | $10-25 | | Business hours | No | No | No | Yes | | Auto-reply | No | No | No | Yes | | Voicemail transcription | No | Yes | No | Yes | | Team sharing | No | No | No | Yes | | Professional greeting | No | Basic | No | Yes | | Works without WiFi | Yes | Needs data | Yes | Needs data | | Off switch | No | Manual only | No | Yes |

So Which One Should You Pick?

It depends on what you actually need.

If you just want a second number and nothing else, Google Voice is free and functional. If you want full cellular separation and don't mind the cost, eSIM works.

But if you're running a business — even a small one, even a solo one — and you want to stop work from bleeding into every corner of your life, a dedicated business phone app is the only option that gives you real boundaries. Not just a second number, but business hours, auto-reply, professional voicemail, and the ability to actually be off when you're off.

A second number is step one. What you do with it — the boundaries it lets you set — is what actually matters.