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The bands themselves are unlicensed; anyone can use them. You don't have to be specifically called "DECT" to use them.

You do in some countries...

What countries require licensing for ISM bands?

DECT uses 1880–1900 MHz in Europe, other countries use similar frequencies, that's not an ISM band.

Fair enough, but that doesn't change the question significantly - what countries require licensing on DECT bands?

Most countries do require the equipent to be licesed, even the folks who operate and deploy then don't need to be.

And equipment for 1890MHz is not approved if it is not DECT.