Where can I find my S-Net contract number?

For the first login, you will find your contract number, which corresponds to the identification number in the upper left corner of your S-Net contract.

Then, you will have the possibility to find your contract number in S-Net as follows:

Login Desktop (www.snet.lu) > Settings > About S-Net > Agreement

or 

Login S-Net Mobile > Settings > About S-Net Mobile > Agreement