Pop-up notification from carrier What is this type of notification called and how can I block these?

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"MTS" is the name of the carrier. The messages are all ads. I've never seen one of these in the UK, but I receive one every 20 minutes in Ukraine. I've not installed anything recently, I only swapped SIM cards.
I have since found that this is neither a push message nor a cell broadcast. I disabled both, yet still received these. One of the two was already disabled by default, can't remember which.

Apparently by inserting the SIM card, I got an "app" called "MTS Menu". This is the app that shows the messages. Using App Master, I found that this app comes from /system/app/Stk.apk:

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"STK" appears to stand for SIM Application Toolkit, basically a feature of SIM cards that enables operators to bundle "value added services", aka bundleware/crapware.

It is really stupid that Android comes not only with this feature enabled, but also makes the source of these pop-ups very difficult to trace.