Oh my god, how did I miss this?!?
As of 01 February 2014, you can buy tickets for TPG by sending an SMS message.
- Send the message “tpg1″ to 788 to buy a full-fare ticket, 3.50 CHF, valid for 60 minutes.
- Send the message “tpg2″ to 788 to buy a reduced-fare ticket, 2.50 CHF valid for 60 minutes.
It only works with Swiss SIM cards.
Apparently you can also buy tickets using the TPG app for iOS or Android devices. This is also news.
Click here for full official details (valid link as of 12.02.2014)