[Idiom] Please help me with a subtitle for a mobile app.

[jasmin39]

Hi,
We have a calling app, and its name is "Talk."
I'd like to ask you to check if the following subtitles are OK or not for the app.
(FYI, its icon shows a telephone image, so you can easily understand that this is a calling app.)　

No.1
Talk - High Quality Sound

No.2
Talk - with High Quality Sound

No.3
Talk - High Quality Voice Calls

Besides, would you please tell me which one is the best??

Thank you!!!

 

[tedmc]

Those are not called subtitles. They are slogans or taglines.
No. 3 is the best but it is rather common and lacks the punch for a tagline.

 

[jasmin39]

Thank you for your response, tedmc!

However, in the Apple's guideline, the word "subtitle" is used.

 

[tedmc]

sub·ti·tle
noun
[COLOR=#878787 !important]plural noun: subtitles[/COLOR]

• 1.
  captions displayed at the bottom of a movie or television screen that translate or transcribe the dialogue or narrative.
• 2.
  a subordinate title of a published work or article giving additional information about its content.
• 
  
  If that is the subtitle (definitioin No.2), then what is the main title?