Don't mess with the High Priestess of Soul.
Nina Simone's 1965 hit "Sinnerman" is an R&B classic ... but that doesn't mean a phone company can boldly rip it off ... so her heirs are suing for $1 Mil minimum ... TMZ has learned.
The lawsuit -- filed by Simone's estate -- accuses smartphone company HTC of using her song in its TV commercial without obtaining the rights.
We reached out and touched someone at HTC ... so far, no call back.
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