This didn't work for me. I can't get Truecaller to show up under "Call Blocking and Identification" no matter what I do.
I contacted support and was told to delete any other call blocking apps (I had Hiya installed so I deleted it), restart the phone, install Treucaller, restart again and then check in "Call Blocking and Identification", but Truecaller never shows up.
Edit: App Store is filling up with 1 star reviews complaining of the same problem.
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I'm still having a problem with this version that I had in the previous version where if I disable Hiya under "Call Blocking and Identification", I can't re-enable it until I uninstall the app and reinstall it. If I just try to enable it, I get a spinning gear for a few seconds and then it shows as disabled again. This persists even if I restart the phone. Once I got the following, but usually it just disables itself without any errors:
View attachment 668372
I noticed that if I install the Hiya app, but don't run it. I can toggle Hiya off and on in the ""Call Blocking and Identification" without issue. I can even continue to do so, if I run the Hiya app and then don't go past the start up page (i.e. don't click "Get Started"). Once I get to the Login page though, I can no longer toggle Hiya on, once it's been toggled off until reinstalling the app, which is annoying because I pay per SMS and I need to receive a SMS every time I want to log back into the app after uninstalling and reinstalling it.
I'm pretty sure under iOS 10, I could toggle this off and on without having to uninstall and reinstall.