Got a text message signed "Lisa" purportedly telling a story about "Jacob" - message contained inappropriate content about pubic region, I will not post it here.
Brief Google search for the sender's phone number reveals that at least one other person got the same message.
Conclusion: this text message was NOT a wrong number, this is someone with malicious intent and a long list of phone numbers trying to discover which of them are valid cell phone numbers. Don't know of a better way to report them than to list them here. Hope someone else can somehow use this information to make the sender stop.