But bear in mind that the message capacity of phone is much more limited than your email account, so spam SMS in quantity could well constitute DoS - you don't *pay* for it, exactly, but you lose some of the functionality of what you've paid for.
The interface on many phones is small and fiddly enough that I don't want to keep having to delete unwanted messages to stop my Inbox from filling up completely.
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But bear in mind that the message capacity of phone is much more limited than your email account, so spam SMS in quantity could well constitute DoS - you don't *pay* for it, exactly, but you lose some of the functionality of what you've paid for. The interface on many phones is small and fiddly enough that I don't want to keep having to delete unwanted messages to stop my Inbox from filling up completely.