Sideline: 2nd Phone Line App

Sideline gives you a second phone number for calling and texting—so you can stay connected without sharing your real number. Get the app today to keep your personal number private.

Whether you're working, selling online, or just want more control over who can reach you, Sideline makes it easy to separate your communications.

FREQUENTLY ASKED QUESTIONS

What is Sideline, and how does a second phone number work?

Sideline is a second phone number app that lets you call and text from a separate number on your smartphone. Just download the Sideline app, and your Sideline number will work alongside your primary number, so you can keep personal and secondary communications separate without needing a second phone.

Can I use Sideline for private texting and calling?

Yes. Sideline is designed for private texting and calling, so you don't have to share your personal phone number with strangers and businesses. Use your second number for work, online selling, dating, or any situation where you want more privacy.

Is Sideline reliable for calls and texts?

Sideline uses your carrier's cellular network (not VoIP), which means your calls are clear and reliable—just like your regular phone number. You can send unlimited SMS and MMS messages and make calls with confidence.

Can I choose or transfer my phone number?

Yes. You can select a second phone number with an area code of your choice, or port (transfer) your existing number to Sideline. This makes it easy to keep a number you already use while gaining more privacy and features.

Who is Sideline for?

Sideline is for anyone who wants a second phone number to keep their personal number private and their communications organized—like professionals and business owners who don't want to carry a second phone, people buying and selling online who don't want to share their real number, freelancers who need to manage client communications—and anyone who values privacy and wants to control who can reach their real number.

Do I need to provide a government-issued ID to create a Sideline account?

No. You do not need to submit a government-issued ID to sign up for Sideline. Instead, you'll verify your account using two-factor authentication (2FA).

Get a second phone number with an area code of your choice, send unlimited texts, and manage calls with powerful tools—all from one app. Sideline works over your carrier network (not VoIP), so your second number is as reliable as your first.

Take control of your privacy and communication with Sideline.

WHY SIDELINE?

Protect Your Personal Number:

- Get a second phone number for private calling and texting

- Keep your real number separate and secure

- Choose a local area code (or an area code of your choice)

- Includes Caller ID and custom voicemail

- Reliable cellular calling (not VoIP)

Private Texting & Calling:

- Send unlimited SMS and MMS messages

- Use your second number for work, marketplace listings, or signups

- Call and text without revealing your personal number

- Access your number from multiple devices

Stay in Control:

- Auto-Reply sends instant responses when you miss a call

- Custom voicemail with message transcripts

- Port your existing number to Sideline

- Block unwanted callers and manage contacts

Smart Communication Tools:

- Save and reuse frequently sent texts

- Add notes to conversations and contacts

- Stay organized without mixing personal and business messages

USE SIDELINE FOR:

- Private texting and calling

- Work or business communications

- Online buying and selling (Craigslist, Facebook Marketplace, etc.)

- Protect your personal number

DOWNLOAD SIDELINE TODAY

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