For many months someone I work for could not call me. It would stop ringing me after two rings. Other calls from the same carrier worked fine, and other phones. Just this one person (who calls me the most). I traced it down to some kind of number block, because it worked fine hen they did *67 first (anonymous call). The caller ID comes between the first and second ring. It finally fixed itself magically recently, after like half a year.
I've had similar. Stuff would just quit, and then one day fine. T-Mobile still can't tell me why there's a notification on my account stating that once we reach June 15 2015, automatic payments will restart.
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