Samsung SM-J320P User Guide - Page 78

 You can edit existing reject messages or create new ones through the Call settings menu. From home, tap Phone > More > Settings > Call blocking > Call-reject messages and edit or create reject messages. In-Call Screen Layout and Options While you are on a call, you will see a number of options. In-Call Screen Layout Tap options to activate them during a call. ● Add call: Tap to initiate a conference call.  After the second call is placed, tap Merge to join the two calls (conference). ● Extra volume: Increase the current volume of the call. ● Bluetooth: Route the phone's audio through a connected Bluetooth headset (On) or through the speaker (Off).  When the call is routed to a Bluetooth headset, the current call area shows the Bluetooth icon. Note: The Bluetooth button is activated to show the current call is routed to the connected Bluetooth headset.  To route the current call back to the phone, tap Bluetooth to temporarily use the phone. Tap it again to route the call back to the connected Bluetooth headset.  When Bluetooth or the Bluetooth headset is turned off, the call is routed through either the earpiece or speaker. Phone App 68