Just got spammed by ebay on my phone

I just got a pre-recorded message from Ebay about the benefits of selling globally. I didn't listen long enough to hear what exactly they were peddling, but I think it was a bit unnecessary to hit me up like that. Thanks Ebay.
Travis
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Comments
<< <i>Was it a text or voice message? >>
wow
<< <i>Voice text message. >>
your right, I don't go too far past the regular phone and text capabilities
<< <i>The reason i asked about voice vs text is because some people are now pre-loading hundreds of these types of messages and walking around public places sending out blasts to everyone who has blue tooth >>
I assume that costs a person who isn't signed up for an unlimited text plan right? Is that currently considered legal to do without prior consent?
Sorry if I'm getting offtopic.