Unfortunately, Laci, the number is probably spoofed and it is not likely you'll ever know who called. 800notes has been inundated with these XXX calls and texts lately. Here's some advice from the FTC:
NEVER respond to these texts
Do not respond to unwanted texts or emails from questionable sources. Several mobile service providers allow you to forward unwanted texts by simply texting it to 7726 (or "SPAM") to block the sender. Check with your provider about other options.
Consider getting a call blocker or downloading a call blocking app.
Here's a forum on the top call blockers for android:
http://www.androidforum.com/topic/4421-top-fr ... way-from-annoy/
Here's a review on call blockers for iphone:
http://www.pacebutler.com/blog/top-10-call-blocker-apps-on-iphone/
Here’s an 800 notes forum in which users discuss the kind of call blockers they have:
http://800notes.com/forum/ta-ae7fb1decae9014/ ... -any-do-you-use
Most importantly, don't let them get to you. Hang in there. :-)