I am trying to change my mobile subscription using upc.ch web site.
To be precise, my current subscription is outdated “Unlimited Europe” (the promo price ends in about a week) which I am trying to change to “EUROPE UNLIMITED”.
After selecting the contract period, the web site is stuck 
forever.
I am on windows chrome browser, but also tried other like edge and ie - neither worked out. This is for a week already 🙁 I wonder if anyone has faced the same problem and how to solve that.
Have a nice day!