At your office, if you want to send and receive sms without being seen by your colleagues use the "Discreet Mode".
It provides a discrete version of the web page PhoneKontrol.
No account creation is required.
www.PhoneKontrol.com you go to your computer and follow the instructions.
New features will be added soon.
You must have a QRCode reader application like Barcode Scanner,ixMAT Barcode Scanner or Goggles (they are free !)
[Same price as a message sent in a conventional manner (ie free if you have a package with unlimited texting)]