So in an attempt to undo all the [wrong word here] apps do in mixing contacts somehow, I ended up deleting all contacts from the entire phone including the SIM card, to then try to put them back either one by one or from a backup.
Though, I can't delete all contacts from the SIM card! Why is that??? Would anyone know? I could delete around 100 contacts, but I can't delete duplications of the contacts. I started blaming Whatsapp, Google account and another one which is MBWAY which is from a bank. They have contacts of their own or something. So I deleted all the accounts and uninstalled Whatsapp and MBWAY, tried again and no success... Now I installed an app called SIM Card Manager which I got from 4PDA, so I'm trusting it's an app that does the things right. And when I go on it to delete the contacts, it says "Cannot delete contact". Another app I got from Play Store allowed me to "delete", but when I restarted the app, it would show all the contacts I "deleted", so it didn't delete at all. The app from 4PDA at least says it can't. But if it can't and it actually knows it can't delete, I'm wondering VERY MUCH why...
Would anyone know why this happens and how I can delete the contacts?? Or I'll get an old phone which never got me any problems and delete the stuff from there... (if the phone will let me, since I can't here). I'm thinking those apps have to do with this. This never happened to me before. First time in my life I see I can't delete contacts. And I'm supposing it's from Whatsapp because one each contact that the person had Whatsapp, I had 2 duplicates of the original one on the SIM card. And I never asked Whatsapp to even try to do that, but why not......
Thanks in advance for any help on this...