Sideline: Private 2nd Number

Sideline: Private 2nd Number

Second Text and Phone Line App

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

Details

  • Released
  • Updated
  • August 25, 2015
  • July 28, 2026

Features

Sideline: Private 2nd Number screenshot #1 for iPhone
Sideline: Private 2nd Number screenshot #2 for iPhone
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

v13.23

July 28, 2026

Every Sideline update improves speed and reliability. This release includes minor bug fixes and enhancements. Thanks for using Sideline!

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Subscription plans

Sideline Standard EarlyAdopter

Sideline Monthly Plan for Early Adopter

$0.991 Month
How to cancel Sideline subscription ⁉️

Charts

Top Grossing

📈 26+2

Utilities

This app rose +2 positions in Utilities chart.

Last updated on August 7, 2026.

Events

Read more about Spam Filtering just got better

Spam Filtering just got better

Send unknown callers straight to voicemail.

Jul 7, 2026 Jul 31, 2026

Read more about Stay connected on game day

Stay connected on game day

Keep in touch with a dedicated second number.

Jun 3, 2026 Jun 30, 2026

Read more about Memorial Day Plans Made Easy

Memorial Day Plans Made Easy

Stay on top of your messages with Sideline.

May 1, 2026 May 31, 2026

User reviews

Bad

Requires a phone number to sign up to get a phone number lol

Poor staff

Got blocked my a staff member for simply using the app, wouldn’t recommend this app to anyone.

Poor communication

I was using the app as well as several of my team members, yes we use it to call people, and I then was blocked with no warning, I woke up this morning with my account blocked which my payment was charged 3 days ago funny enough… you’re not allowed to be unblocked from the app, the support people say “sorry, that’s all I can do” that’s the most robotic answer they could’ve given me.
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Update Glitch

Today’s update broke it! (iPhone 17)

Poor Quality

“This is the most horrible phone service app out there. They’re so worried about their appearance? They should be more worried about function. Every survey is about appearance. My messages don’t go through to people, almost weekly. I don’t get notifications for messages, so often I’ll open the app to send something out and have messages waiting. YOU MAKE ME LOOK BAD. I am a doctor utilizing an app so I don’t have to carry two phones while raising a family and it has not only lost me business, it has failed me in showing up for my clients and operating a professional establishment. Their “support” has never helped me either but has always just pushed off the problem. I’d only recommend this app to someone looking for a CHEAP phone line to let their business FAIL.”
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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.