How to disable USSD notifications? On Android 4.2.1, some new stuff has appeared in the notification area. It shows my current balance and has an icon of the "SIM-card menu" app. Also, sometimes, some spammy messages appears (from my operator) that look like response to standard USSD request. On a previous OS, there was no such behavior.

How can I disable this? Is it OS or operator-related stuff?
If you have root, you can install the XPosed Framework and install the Ussd blocker module.