Yes. Premium text and picture messages are not included with your monthly plan. This applies even if you have unlimited messaging in your plan. So if you sign up for any text messaging contests, you will be charged by third party companies to use their service. It's important to always read the fine print before signing up for these contests and be aware of what you're agreeing to. If you currently subscribe to a service of this nature and wish to unsubscribe, text back "STOP" and the text messages should stop.
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