How to block SMS on 4G?

CORE
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1

Hello Experts.

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How to block SMS on 4G? Keep it on 2G / 3G such that if user wants to send SMS, he falls back to 2G / 3G?

How can this be done?

2

What is the need for CS fallback for SMS?

If you don’t have IMS, you can use SMS over SGs.

3

We have IMS, but we want to fallback.

4

Ok, understood.

But I’m curious, is this due to license limit?

5

It is a test we want to try.

Anyone done this?