[inquisitor]

Start Mobile Partner, click the button labeled with "Text" or "SMS". Now some icons will appear below, where the first (an envelope with blue top) stands for new text message. Click it and a window for composing a new text message will appear. In the upper field enter 7777 and in the textfield below enter START DATENFLAT. Finally click "Send".

Then leave Mobile Partner opened in order to be able of receiving SMS and wait for a confirmation of your subscription. Perhaps you will be required to confirm once more - e.g. with Fonic (another provider) when you subscribe to data options by SMS you need to reply "JA" to the confirmation SMS. Just try to translate whatever Tchibo tell you in that message and take action if you are being asked for some further confirmation.

Sent messages are stored in the "Outbox" folder of Mobile Partner.