I believe this number is a "Training" service. I have learned never to give my cell to anyone other than personal friends, doctors etc. I signed up for a "free" job search engine and behold two days later these people are calling me four times a day. So called free job services make their money giving your personal information to training venders.
I recommend getting Google voice, a free service which gives you a virtual number which will ring your cell if you wish it to. This way you can screen your calls and block any numbers you find annoying and it never touches your real cell number. Now if I am checking out free software or other free services I can give them my Google voice number and do not have to worry about spam calls. Anyway, this works for me. Good luck. In the words of Gandalf about personal cell phone numbers: "Keep it secret, keep it safe!"
. They're calling about giving you educational info. Just call the number back, it'll take a while for them to answer but when someone gets on tell them you haven't requested any information and you are not looking for any. They'll remove your name and number. They aren't bill collectors so don't be afraid of them.