My9, I had the same problem with my pre-paid cell phone. Not only was I getting spam calls and text messages which were eating up my minutes, I was getting calls from 2 collection agencies. My cell provider could not block the calls and registering with the Do Not Call for cell phones did not help, even after a month. I finally had to call my provider and have them give me a different number.
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If life gives you lemons, make lemonade. If life gives you tomatoes, make Bloody Marys.