A reliable 2nd number is just the start.

Sideline’s suite of features helps you protect your privacy, create a professional identity, prioritize work calls, add team members, and get more done.

2nd Number

Sideline gives you a premium second phone number that works just like your first.

Reliability you can trust.

Our patented technology connects right to your carrier’s network, so you’ll get unrivaled call quality anywhere your phone gets reception. Unlike VoIP services, Sideline gives you the freedom to leave your WiFi network.

Pick your number, build your identity.

Choose a local area code and search for a memorable number. Or use number porting to transfer an existing number from another device or landline.

Texting, calling, and voicemail included.

Texting is unlimited, calling works with your carrier minutes (which are likely unlimited), Sideline voicemail is easy to customize, and everything stays separate from your other number.

2nd Number Features

Number Porting

Transfer an existing 2nd number from another device or landline.

Group Messaging

Add multiple people to the same conversation. The more the merrier.

Separate Caller ID

Differentiate your 2nd number with Sideline’s custom caller ID.

Voicemail to Text

Automatic transcriptions let you read your voice messages on the go.

SMS + MMS Messaging

Send unlimited text, picture, or video messages.

Use Your Minutes

Sideline calls use minutes from your carrier plan, which are likely unlimited.

Custom Voicemail

Record and manage multiple personalized or professional greetings.

VoIP Optional

If cellular service is less than stellar, turn on WiFi calling instead.

Work Texting

Sideline makes it easier to communicate with friends and colleagues.

Reach people on their terms.

Texting is a more effective, personal, and convenient way to communicate. 95% of texts are read within 3 minutes, and people still have the flexibility to reply on their own time.

Respond faster.

Everybody’s schedules are packed, and a text conversation makes all the difference. Plus, Auto-Reply can send instant responses anytime you can't get to the phone.

Text as a team.

With Team Number, one phone line can be added to multiple devices. This lets your whole team text and reply from their own personal phones.

Work Texting Features

Unlimited Texting

There are no messaging caps. Everything’s included in your monthly subscription.

Branded Messages

Add an image or logo to your texts or auto-replies for a branded experience.

SMS Messaging

Nobody needs a special app to text you, just a cellphone.

Group Messaging

Add multiple contacts or colleagues to the same conversation

MMS Messaging

Send pictures and visual updates of projects, or anything else.

Custom Signature

Let people know it’s you with a signature that appears under your message.


Automatically respond to missed calls or texts whenever you're busy.

Customize Content

Personalize your Auto-Replies by adding helpful links, contact info, and more.


Sideline automates communication whenever you're busy.

Save time, stay connected.

When someone contacts you, Auto-Reply immediately sends them a text response if you don't answer. This lets you stay connected with friends and colleagues—even when you’re busy.

Build your brand.

Add an image or logo to make every Auto-Reply a branded experience. Each message helps you stand out, look more professional, and increase consideration for the people who receive it.

Customize away.

Set different replies for inbound calls or texts. Create versions for when you're in a meeting, on vacation, or anything else. Or include helpful links, contact info, and updates.

Auto-Reply Features

Auto-Reply to Calls

Automatically respond to any missed call.

Branded Messages

Add an image or logo to your texts or auto-replies for a branded experience.

Auto-Reply to Texts

When enabled, you'll respond to any inbound text, automatically.

Customize Content

Personalize your Auto-Replies by adding helpful links, contact info, and more.

Reply to Any Cellphone

Auto-replies can be sent to any mobile phone number in the U.S.

Link to Your Website

Add a URL to help friends and coworkers find more information.

Landlines Go to Voicemail

When a landline number calls, they'll simply hear your voicemail.

Team Number

If Auto-Reply starts a conversation, anyone on your team can finish it.

Team Number

Sideline lets you team up and share responsibility for one line of communication.

Put one number on multiple phones.

Enabling Team Number is as easy as sending coworkers a text invite. Once they accept, your Sideline number is accessible from each of your phones with the full suite of features and benefits.

Work better together.

With your team up and running, everyone shares an inbox and communication history so it’s easy to see who’s doing what. Inbound calls or texts ring everyone simultaneously. Outbound calls or texts come from the same number.

Let productivity ring.

Team Number users report being 60% more productive, missing 50% fewer calls, and seeing a bump in overall satisfaction of communication. The only thing recipients notice is that you’re more responsive.

Team Number Features

Shared Inbox

Everyone can access the same conversations from a shared inbox.

How Calling Works

Whoever answers first wins. Outbound calls come from the same number.

How Texting Works

Anyone can send outbound texts, which also come from the same number.

Mobile Admin

The original owner of the number can invite and manage team members.

Monitor Activity

Everyone can see who’s doing what to make teamwork more transparent.


If an Auto-Reply starts a conversation, anyone on your team can finish it.

Team Attribution

Sideline logs communication history so it’s clear who sent a text or placed a call.

Seamless Experience

If you don't mention it, recipients won't know which team member they're texting with.

Follow your calling.

Sideline gives you a 2nd number with all the communication tools you need to start, work, grow, and pursue your passion.

Try it free for 7 days — Only $9.99/mo after

Available for iOS and Android.