I haven't looked into this since last year, but the FCC was advising on a shared blacklist to be implemented in the future back then.
Also beware that the phone might be stolen, which could lead to more problems in the future.
I've never used Straight Talk, but if they use AT&T towers maybe call AT&T. Honestly, it might be hard to get a real answer from them because most of the reps (true for all companies) don't have a clue how their own blacklists even work - heck, some don't even seem to know they *exist*.
They might not be "lying", it just might not be part of their training is information base.
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