Stay private
with a 2nd phone number

Stay private with a 2nd phone number

The Sideline app gives you a reliable 2nd number to share publicly, keeping your personal number private and protected.

Get the App
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Protect your identity

With a separate 2nd number, Sideline helps you stay safe and anonymous whenever you need to.

Communicate with confidence

Use your Sideline number when contacting strangers and businesses, signing up for services, buying or selling online, and more.

Avoid spam & scams

Sideline suggests names of unknown callers and texters, and helps you recognize spam by clearly labeling and displaying it.

A second phone number—and so much more

Superior Call Quality
Superior Call Quality

Sideline uses your carrier’s network for top-tier call quality.

No WiFi Needed
No WiFi Needed

Unlike VoIP services, Sideline gives you the freedom to leave your WiFi network.

Avoid Spam
Avoid Spam

We detect spam calls, telemarketers, and potential fraud so you can easily avoid them.

Auto-Reply
Auto-Reply

Send an automated text reply to any missed calls or messages.

Voicemail
Separate Voicemail

Record your Sideline greeting so people can leave a message after the beep.

Unlimited Messaging
Unlimited Messaging

Send unlimited SMS, MMS, and group messages.

Number Porting
Number Porting

Already have a second number? Bring it to Sideline from another device or landline.

Ring and Text Tones
Ring & Text Tones

Differentiate between numbers with unique ring and text tones.

Get started with Sideline today

Available on iOS and Android.

app store
google play