The Sideline app is designed to provide an additional phone number on your mobile device without affecting your regular phone bill. When using Sideline, you can make calls and send text messages using the app, and these activities will not show up on your phone bill.
Typically, your phone bill will only display the usage associated with your primary phone number provided by your mobile carrier. Since Sideline assigns you a second phone number (known as a pilot number), any calls or texts made through Sideline will be associated with this secondary number and will not appear on your regular phone bill.
However, it is important to note that while your Sideline activities are not visible on your phone bill, you may still see two numbers related to your Sideline account. These numbers are your pilot numbers. One pilot number is used for incoming calls, while the other is for outgoing calls made through the Sideline app.
In my personal experience, I have used Sideline for several years and have found that my regular phone bill only reflects the usage of my primary number. The calls and texts made through Sideline, even though I use them frequently, have never appeared on my bill.
To summarize, the Sideline app does not show up on your phone bill. The calls and texts made through Sideline are associated with a separate pilot number and will not be visible on your regular phone bill.