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.
Communicate with confidence
Use your Sideline number when contacting strangers and businesses, signing up for services, buying or selling online, and more.
A second phone number—and so much more
Superior Call Quality
Sideline uses your carrier’s network for top-tier call quality.
No WiFi Needed
Unlike VoIP services, Sideline gives you the freedom to leave your WiFi network.
Avoid Spam
We detect spam calls, telemarketers, and potential fraud so you can easily avoid them.
Auto-Reply
Send an automated text reply to any missed calls or messages.
Separate Voicemail
Record your Sideline greeting so people can leave a message after the beep.
Unlimited Messaging
Send unlimited SMS, MMS, and group messages.
Number Porting
Already have a second number? Bring it to Sideline from another device or landline.
Ring & Text Tones
Differentiate between numbers with unique ring and text tones.
Get started with Sideline today
Available on iOS and Android.
Sideline vs. Google Voice
When you compare,
there’s no comparison.
Sideline
Google Voice
2nd Phone Number
Choose a reliable 2nd number with unlimited calling, texting, and voicemail. Learn More
Personalized Number Combinations
Select a local area code of your choice and search for memorable letter and number combinations.
Patented Carrier Call Quality
Unlike Google Voice, Sideline uses proprietary technology to connect calls via your cellular network for unrivaled reliability.
Unified Inbox
Sideline streamlines your communication by managing calls and texts in one place.
Advanced Caller ID
Sideline displays a suggested name for incoming callers to help you identify and prioritize them.
Auto-Reply to Calls & Texts
Automatically respond to missed calls and texts whenever you’re busy. Learn More
Multiple Voicemails
Create and manage multiple voicemail greetings for different circumstances.
Verification Codes
Unless you port your native number into Google Voice, you cannot receive verification codes for account authentication.
Live In-App Chat
Have questions or need help? Get help immediately via live chat through the app!
Follow your calling.
Sideline gives you a 2nd number with all the communication tools you need to start, work, grow, and pursue your passion.
Start your 2nd number experience
Available for iOS and Android.
Here’s what users are saying about Sideline:
“A+ Great APP and excellent for business use. The app just works so much better than Google Voice!”
– SethMickle, Sideline User
“I definitely recommend Sideline over something like Line2 or spending with grasshopper. Great app guys!”
– Osei Jenkins, Sideline User
“I choose these guys over Vonage and Line2… I’ve had all three. Sideline is hands down the best!”
– OmegaPsiPhi, Sideline User
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