Who called from 4088027416

I got a text say, "r u there? Feels like a text scam. They'll probably subscribe and charge me if I respond.
How'd they get my number?

I also recieved a text last night at 3am (EST) saying "r u there?". I have a few friends who are flight attendants and travel to California so I wasn't sure if it was someone texting from another persons cell so I texted back asking who they were...no reply. Now that I see this I know it's something fishy. Can they do anything if someone replys to the text?

Rec'd a text on my office berry "r u there"at 3.40 am

Received ........text r u there?.......July 10 6:14am

Go a message asking if i wanted to earn money working from  home then i should reply with FREEDOM.