You can check your balance and manage your mobile plan 24/7 by using the self-service feature - just send a text to 611611. If you're experiencing any technical issues, you can call also 1-877-430-CELL(2355). For any other queries, you'll need to mail the company at : Straight Talk, Inc., 9700 NW 112 Avenue, Miami, FL 33178. Ensure all mail is marked  for the Attention of the Executive Resolution Department.