so I got my bill from cosmote that I should pay 0euros..
When I mentioned before receiving the first bill, they told me: “you should first get the first bill and come to our shop”
then I got the first bill, went online and I could register whatevah I wanted no matter the mobile number owner. who knows.. they said they will send me the bill in my email without validating I actually had the number in the first place.
it’s 2016; yes yes yes!