How to Enable Whatsapp Voice Calls without invitation Feature on Android SmartPhone

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How to Enable Whatsapp Voice Calls Feature on Android SmartPhone 

Method 1 - Invitation Method :
What you need :
1) WhatsApp version 2.11.508 and Up

Steps :
1) For this you need to ask someone (Who has WhatsApp Calling Feature) to call you
2) Done!! Your calling feature is now unlocked
- Now you can call another person to enable this feature on his/her WhatsApp

Method 2 - Enabling it from Terminal (Root Needed) :
What you need :
1) WhatsApp version 2.11.508 and Up
2) Rooted android device
3) Terminal (You can download it from here : http://bit.ly/1ldVgjK)

Steps :
1) Open terminal
2) Type in this code :

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1	su -c am start -n com.whatsapp/com.whatsapp.HomeActivity

3) Done

Note : This method have some drawbacks :
1) You cannot invite someone to use calling feature after activating the same feature using this method
2) You can only call to someone who have enabled this feature using the same method

Method 3 - Enabling it from Root Explorer (Root Needed) :
What you need :
1) WhatsApp version 2.11.508 and Up
2) Rooted android device
3) Root Explorer (You can download it from here : http://bit.ly/1Ltr1Tn)
4) An invitation from someone who has this feature enabled (OR this method will not work)

Steps :
1) Open root explorer
2) Now go to "/data/data/com.whatsapp/shared_prefs/com.whatsapp_preferences.xml"
3) Now type these 2 lines (code) anywhere between "<map></map>" :

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1 2	<boolean name="call" value="true" /> <string name="call_allowed">all</string>

4) Save this file
5) Now go to Settings>App>Whatsapp and "Force Stop" the application
6) Re-run the application again 
7) Done!!

That’s it now you’ve successfully enabled whatsapp calling feature in your smartphone. Enjoy!!

for invitation call plz comment with your no