jeremieBchx74 This is a customer help customer community, so we don't have access to your data.
You can find your bills in the customers center MySwisscom (the access data are the same as for e-mail,, TV-air or normally also this Community), if no more know them, you should contact the Hotline 0800 800 800):
https://www.swisscom.ch/myswisscom/dashboard
If you can enter there you go directly to "Bills" and click there:

then to respective month:

and there you find the in the pdf with invoice number (germ. Rechnungsnummer)
