Sideline: Private 2nd Number

Sideline: Private 2nd Number

Second Text and Phone Line App

15K ratings
232 reviews
#16 in top-grossing Utilities
🔧 Utilities
📊 Productivity
Free
In-App Purchases

Details

  • Released
  • Updated
  • August 25, 2015
  • October 6, 2026

Features

Sideline: Private 2nd Number screenshot #1 for iPhone
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Sideline: Private 2nd Number screenshot #3 for iPhone
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Sideline: Private 2nd Number screenshot #7 for iPhone
Sideline: Private 2nd Number screenshot #8 for iPhone
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About

This app provides a dedicated second phone number for private texting and calling. It offers features like unlimited SMS/MMS, custom voicemail, and auto-reply to help manage communications and keep conversations organized across devices.

✓Second phone number with local area code
✓Unlimited SMS, MMS, and text messages
✓Custom voicemail with transcripts
✓Auto-Reply for missed calls
✓Split number across multiple devices
✓Transfer existing phone numbers
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What users say

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What's New in Sideline

v13.28

October 6, 2026

Every Sideline update improves speed and reliability. We improved inbox actions, message reactions, conversation details, and voicemail controls. Thanks for using Sideline!

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14

Subscriptions & In-App Purchases

Sideline Standard EarlyAdopter

Sideline Monthly Plan for Early Adopter

$0.991 Month
How to cancel Sideline subscription ⁉️

Charts

Top Grossing

📊 16

Utilities

The app has maintained its position at 16 recently.

Last updated on October 12, 2026.

Events

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Keep work and school calls off your personal line.

Sep 2, 2026 — Sep 30, 2026

Read more about Introducing AI Responses

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Aug 5, 2026 — Aug 31, 2026

User reviews

Porting of existing number

Hoping to get a quicker reply if you have this pulled over within a day or two as I do not want to use my former Carrier

CarPlay When?

So far, I enjoy using it. It works. Though there are still bugs here and there. One of my bosses isn’t able to send me photos from his iPhone. Not sure which one he has. But others have no problems. And sometimes I don’t hear/get a notification sound. Specifically over Bluetooth. When calling via CarPlay, I do see the contact info of who’s calling. Any way to see a notification that we got a message via CarPlay?
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Waste of Money

I was using this for work to communicate with multiple clients. The very fact that I sent a few messages that were copies of one another BLOCKED my service. When I contacted them about this issue they told me to find another app!! What?! It’s such a waste of money.

App error

The minute I downloaded the app I received an error message after attempting to sign up, like most people would I tried again twice no luck, the next day after letting it rest I tried again another error message I reached out to support and they told me they couldn’t help me because I tried to sign up more than once and I wouldn’t be able to use the app
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Error

All you get is error 403 and I did the steps in article nothing.

Developer apps

User experience

🐞

Reported Bugs

4 issues

Text messages not delivering properly

Bug

Missed call notifications not working

Bug

Billing and account management issues

Bug

Compatibility problems with VPNs and other apps

Bug
✨

Requested Features

5 requests

Ability to separate business and personal contacts

Feature

Web/desktop messaging functionality

Feature

Apple Watch app integration

Feature

Improved search and organization tools

Feature

More customization options

Feature

FAQ

What does Sideline do?

Sideline provides users with a dedicated second phone number that functions like a primary line. It allows for private texting, calling, and includes features such as custom voicemail, unlimited SMS/MMS, and auto-reply to manage communications effectively.

What are the key features of Sideline?

Key features include setting up a new local phone number, sending unlimited SMS and MMS messages, creating custom voicemails with transcripts, and utilizing auto-reply for missed calls. The app also supports splitting a number across multiple devices and transferring existing numbers.

How much does Sideline cost?

Sideline is a paid service with subscription plans billed monthly or annually. Users can manage their subscriptions and turn off auto-renewal through their iTunes & App Store account settings. Any unused trial periods are forfeited upon purchasing a subscription.

Is Sideline compatible with my device?

The provided description does not specify exact device compatibility. However, it mentions that the Sideline number can be accessed and used on 'any device' and can be 'split between multiple devices', suggesting broad mobile compatibility.

What are common use cases for Sideline?

Common use cases include maintaining privacy by separating personal and professional contacts, managing business communications with a dedicated line, or using it as a temporary number. It's ideal for anyone needing a reliable second line for calling and texting without a separate physical phone.