Called to my husband's cell phone number just recently. They left a voice mail, automated machine asking for me (gave my name).  The voice said they call from Blue Care Network, and said there was an important information to give to me and so needed to contact them. I called directly to the actual phone number I have for Blue Care network, which starts with 1-800. When I gave her the number 313-243... she said it is not theirs. She also mentioned that other people have asked BCN the same. Do not answer, neither call them back.
By the way, TMobile labels this number as Suspected Spam.