I know this is an old thread, but this is for future ref:
This was done using bots that let people try tons of numbers until they found one that worked. Once they had numbers to use, they would enter your info into the Telia website along with the phone number of some legit customer. That legit customer was now paying for your subscription to Spotify.
I know this thread is old but, I bought a 1 year subscription on ebay for $1.55. I got a message with ebay with an account created with the same name as my ebay account and a password that i could change. I doubt it will last but,for the price of a cup of coffee I figured I'd try it.
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