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Although it can be inconvenient at times, I had Sprint block them on my account a couple of years ago. My son's phone was slammed with several bogus 3rd party charges (ring tone services) that I knew he couldn't have signed up for (the times they said the received the subscription message, the phone was off and at home while he was at school - the elementary school didn't allow any student to have a mobile phone on their grounds).
While Sprint finally canceled the charges, it was enough of a hassle that I had them block short-codes. In your case, the account owner should be able to call Sprint to allow your phone to access them.