Sideline SMS Verification

The Sideline SMS verification is the first step to a second line for work, so know what a virtual number does and does not solve before you register.

Sideline is a second phone number app from Pinger, Inc., the maker of TextFree and Index. You can choose a new number with the area code you want or port an existing one, and you get SMS/MMS, voicemail transcripts and automatic text replies to missed calls. Sideline says calls run over your carrier network rather than VoIP, and signing up requires a working phone number.

You can receive the sign-up SMS on a virtual number, but because Sideline routes calls over the carrier network, the link between the verified number and the line you actually use matters, and calling features may not work as expected. A virtual number makes most sense for trying the app, testing its messaging features or keeping your personal number out of the registration step.

Your Sideline number may become the line you share with clients, and keeping it depends on your subscription and account. Check the subscription terms after the free trial, back up important work conversations and keep a verification number you can always access. If you are porting a number, do not cancel your old line before the port completes.