Initially, Sideline was designed to use the minutes from your carrier to let you place and receive calls. Now, you can use WiFi to do this which won't use up your minutes and will help you avoid any fees.
If at any time you are abroad, you can use WiFi to place calls to U.S numbers and not be charged for international calling fees or data.
For a small price, you can unlock this feature!
To subscribe, simply go to your Sideline settings and tap VoIP Calling
The screen below will show that your VoIP Calling setting is enabled
Please note, turning this setting off will not cancel your subscription. It will only turn the setting off and use your carrier minutes.
To cancel this subscription, you will need to go to the App Store to avoid further charges.
TERMS – The required Sideline Subscription and all other in-app purchases are automatically billed monthly or annually to your iTunes Account and auto-renew, unless auto-renew is turned off at least 24-hours before the end of the current period. Payments will be charged to your iTunes account upon confirmation of purchase. You can turn off auto-renew or manage subscriptions in your account settings. Cancellations take effect at the end of the active subscription period. Any unused portion of a free trial period, if offered, will be forfeited if you purchase a subscription, where applicable.
*Data and Internet connectivity are still required for general functionality. “Using your carrier network,” makes call quality more reliable than calls over VoIP or Wi-Fi.