I already explained to you that the IPs used to haxor you are IPs belonging to the Tor network. https://www.torproject.org/

yes there will be lots of IPs from all around the world used.

How answer the more interesting questions.

a) have you ever logged into bitstamp from your phone
b) do you use e-mail on your phone and have a e-mail client on it with your password saved
c) was the phone connected to wifi or a network provider with a data plan at the time in question?

Protip for everyone: There is a small program called "JAuth" with is a Java based open source implementation of Google 2FA. You can install this on an old otherwise unused computer that is not connected to the internet or anything else. There are also cheap $90 android phones you can use for this purpose, only install google auth on it and nothing else & delete all the google spyware & permanently turn off wifi and don't have a SIM card in it.

Also people, beware that 25 BTC is a lot of money. There are those willing to do customized targeting (including social engineering attacks) to get at that kind of money. U fat and ugly and some hot blond girl approaches you and wants to fuck? be suspicious, she's likely after your money