Is it possible to delete a threema account including all chats and images from remote, eg. from another iphone or from the desktop. I have lost my iphone and want to make sure no one can access my threema account. I have a 4 digit PIN.
No, unfortunately I think it is not possible to remote delete Threema.
However, have you set a revocation password for your ID (and still remember it)? Then you may at least prevent others from using your ID in future by permanently disabling it. See http://myid.threema.ch/revoke However, that means that you also cannot use your ID in future even if you have an ID backup, and need to create a new one.
If you haven’t set an ID revocation password but still have an ID backup at hand, you may set a revocation password by restoring the ID on another device, set one, and then revoke the ID using the above URL.
Otherwise, I’m not aware of a possibility to revoke your ID.
