hello steemit users now i am discuss and review of the most uses app for video calling(imo)in any corner of the world. It is about 500 million downloads.now we are discuss permissions part on the app.
1.in app purchases($) : no cost free download
2.contacts: modify your contacts and allow contacts number
3.Sms: read your text messages (sms or mms)
4.Microphone: phone microphone also allow
and app start that time it's run start up
Then you agree to all permission and so you start download . After you sign up your mobile number and open a new account. Let's you invite your friend and video calling of your contact list numbers.
All the things possible for science and all credit goes to science of his wonderful invention.