Finding a lot of spam you want to can or cannot get off mailing lists? First thing is not to 'unsubscribe' except from the larger reputable companies (preferably in your privacy settings account with them like, say, Amazon) because that verifies your email is active to spammers and a human is looking at it.

On your Apple iPad for Yahoo account, for example. download the Yahoo Mail app to your iPad. (this will not work on the iPhone one because the options are too limited). Sign up, etc. then whenever you see in your Apple inbox client a spam email(s), (do not open them but it is ok for them to download), FIRST open your Yahoo account and immediately check the box without opening it and mark as spam with the shield icon. This will drive it to the spam folder. After doing this several times, you are 'training' Yahoo's spamfighter system to put all future email from that domain to spam. You can then go back to your regular inbox and they will 'disappear' from the inbox.

This will severely reduce spam. Briefly scan your emails in that folder once every 10 days or so to be sure your friends' emails and regular company emails are not being lost. Use the unspam shield check box with the nil bar to get them back into your inbox and retrain Yahoo to keep those. Similar procedures can be done with Android or other providers' apps as well. This goes a long way in clearing spam but keeping what you want. Spam is more prolific in email simply because it is 'free.' Companies are not going to invest huge sums where they have to pay considerably such as texting and where gov 'do not contact' lists can be registered for your personal phone. Of course, there are occasional violators only gov can stop.