A second number
is just the start

It's an entire phone system in one simple app

Get the App

A real phone number

Choose a local area code (if you want) and get a 2nd number on your smartphone.

Carrier reliability (not VoIP)

Calls use your carrier and minutes (which are likely unlimited) so everything just works.Learn more


Texting is free and unlimited. Sideline's inbox puts all your communication in one place.

Transfer your number

Don't need a new number? Number porting lets you move existing numbers to Sideline.Learn more

Separate voicemail

Record and manage multiple voicemail greetings for your Sideline number.

Know who's calling

Separate caller ID, notifications and ringtones let you know who's contacting you.


Get your voicemails transcribed and read them as a text message.Learn more

Auto Reply

Send automated messages to any incoming call or text when you're away or busy.

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Protect your personal number

With 2 numbers on 1 phone, you simply open the Sideline app to call or text from your second number. Your personal number stays totally separate.

Benefits of a 2nd number
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Reliability like no other

Calling works with your cellular network and minutes (which are probably unlimited). This lets you share minutes between two lines and gives the same great call quality you get from your regular number.

Learn how it works
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Keep work and life separate

Whether you're a white collar, blue collar, or no collar worker, Sideline comes with features that help simplify work communication.

Business Solutions