Yes, you can also buy tickets without a smartphone. You can order your tickets from your computer, but you will need a (mobile) telephone. This is because you need to receive a text message in order to log in.
Click here to read a complete list of everything that you need to buy tickets.
Important information:
If you buy tickets this way, be sure to bring your mobile phone and ID to the event, and collect your tickets from the front desk of the venue.