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WhatsApp is a reliable and secure channel for making voice or video calls as it prevents network issues with mobile data usage. But soon, the messaging app could become your default calling app on your phone, replacing Google Dialer or Truecaller. WhatsApp allows you to call contacts but it can be difficult to call someone not added to your phonebook, this is where Dialer can simplify the integration process and give users one app for all their calling needs.

WhatsApp In-App Dialer Feature Beta Test: What We Know
The feature has been spotted in Android beta version 2.24.9.28 which is yet to be rolled out to testers but may be available soon. We still don't know where and how the dialer interface will be integrated but it's likely that the Call tab on WhatsApp will have a dialer shortcut that will expand when you tap/click on it. Having a dialer allows you to call any number, even those not added to your contact list. WhatsApp automatically sources all the contacts stored in your phonebook but it cannot access caller details from the regular dialer apps you have from Google or Apple on Android and iPhones respectively.

Having said that, Truecaller gives you the option to message someone on WhatsApp from its dialer interface. WhatsApp calls work over Wi-Fi or mobile network making it a reliable platform for making international calls at really low cost. WhatsApp calls are also end-to-end encrypted, and it's likely that any calls you make using the in-app dialer should be secure as well. We'll keep an eye on future beta versions and see how the dialer feature pans out. The messaging app is also keen to let you send files or photos to nearby people without using the internet. The offline mode of file sharing can be WhatsApp's version of Nearby Share/Quick Share that lets you share files and access nearby devices using Bluetooth.

The feature is currently being tested with the Android beta version which clearly shows that WhatsApp asks for permission to access nearby devices on your phone, your photo gallery on the phone, and device location, which also requires nearby sharing to be turned off. - Internet file sharing tool to work.