Today we have some good news as the WhatsApp Voice Call feature has been officially released for the Samsung Z3 smartphone and is said to be coming soon for the Z1. There was previously a BETA release in order to make sure this will be a bug free release, or as much as possible.
In order for you to make use of the voice call feature you need to be on software version BPD4 - Z300HODD0BPD4. The maintenance release to enable this feature on the Samsung Z1 is expected to be released very soon.
If you do not get automatically prompted to update your firmware, you can manually check by using the steps below:
Let us know how you get on with Voice calling in the comments.