Check your billing cycle on the phone company's website. They may continue your service and expect you to pay. They are not just going to turn off your phone without telling you. They think you are regular customer. Don't you get text messages regarding your billing?
Moderator note: I had to edit out the url provided, as it revealed the client; the MSC is named in the subject line. But you all should be able to figure it out.
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I could agree with you, but then we'd both be wrong.