Unsolicited Email or Messages
Spam is harmful because it take more time to go through your inbox, it costs more money on your SMS charges, and it can spread malware.
They can be very high because of spam.
Spam can make it take a long time to sort through emails.
Spam is a common way to spread malware.
You can avoid spam by setting up spam filters, not replying to spam, and using one use email addresses.