Samsung began rolling out their Nougat update to the Galaxy S7 and Galaxy S7 edge recently, and even though the update was meticulously tested it looks like Optus users are having issues, but there’s a fix.
The Optus software testing team has identified an issue in the update and while they’re working with Samsung to get it fixed at the source so no further handsets are affected, for those who do have the issue there’s a workaround. Optus is advising that to fix the issue you simply have to switch Voice over LTE (VoLTE) on. Yep, that’s it. It apparently
What is IMS Services? Well, IMS is IP Multimedia Subsystem, and it’s basically to do with routing calls over an IP based system or bascically it seems that Wi-Fi calling is the issue.
The error has affected more than just Optus users with a quick search of the internet showing this at least affected the AT&T update in the US as well.
If you’re having the issue, try that out and you should be right to go. If you need help with turning VoLTE on, then head over to optus.com.au/volte-support