Sent a text that said: hi Julian...

Replied, got no response...

Happened to me too.  They said I had to log on to Yahoo messenger to find  out who they were. I just left it alone after that.

Forward the text to 7726:

Security company Cloudmark created a spam messaging reporting service that nation’s major wireless carriers agreed earlier this year to start using. Now, customers of AT&T Mobility, Verizon Wireless, T-Mobile, Sprint and others can forward their text spam message to 7726. The mobile phone carrier will ask customers for the phone number that’s linked to the spam message so they and Cloudmark can start investigating.

http://www.ajc.com/news/business/text-spam-messages-on-the-rise/nSW3C/

A text message, "Hi Jim", with no source identifier except this phone number... Spam