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No title
 Question: 
Why did the call button disappear from my messaging 
app after updating my device? 
  
Answer: 
With One UI 4 (running on Android S OS), there has been a change in the layout of your messaging app. To find the call button, simply tap on the contact's name or phone number at the top of the screen. This will expand the title section, revealing the hidden voice and video call icons.  
  
Terms: 
Android S OS - A mobile operating system developed 
by Google. 
One UI 4 - Samsung's user interface designed 
for their devices, based on Android S OS. 
Messaging app - An application for sending 
and receiving text messages and multimedia messages. 
Call button - An icon within the messaging 
app to initiate a voice or video call. 
Contact's name/phone number - Identifier of 
the person you want to communicate with through the messaging app. 
Voice call - A telephone conversation using 
a mobile device. 
Video call - A real-time audio-visual communication 
using a mobile device. 
  
                                                                                                                                          
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