keeps sending text messages and pictures tjqt are of graphic nature

Do not respond to unwanted texts or emails from questionable sources. Several mobile service providers will allow you to report unwanted spam texts by simply forwarding them to 7726 (or “spam”) to enable the providers to prevent future unwanted texts from the specific sender.

TIP:
Put 7726 in your contact list, so you can easily forward those unwanted texts!

Source:
http://www.fcc.gov/guides/spam-unwanted-text-messages-and-email

More info:
http://en.wikipedia.org/wiki/Mobile_phone_spam
http://blog.usa.gov/post/89152807112/protect-yourself-from-text-message-spam

However, in many cases, the text origin, as seen on your phone, is faked.  The internet domain does not exist, or the phone number may have been spoofed.

Just received unsolicited text from this # wanting me to text back.

received "message from e-mail" as text message. 10:15 pm CA time......  immediately deleted without opening

Received a text from this number, followed by a picture of a young woman dressed immodestly. Asked sender to stop sending messages. Will also block the number. Must be a bot...