Just google for "форум пробив" and you will find black market for accessing any kind of information, including SMS, phone location, etc and associated services for hacking accounts (VK, Gmail, etc). You don't need to be a government, it is open for everyone.
That type of service can allow the attackers to access SMS contents, but not from swapping numbers back and forth between SIM cards. And without it, the victim will know he is being attacked.
