[sinisterlee]

I haven't, they look very good but going through them quickly, looks they provide US/Canada or UK numbers.
So not something that I need at the moment.

Further update:
Calls and messages come through from regular numbers but it did not work twice, for receiving a message from popular email provider and a carrier.

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I mean it is not really that much work but it would be much nicer to have one platform from where you could access multiple sims from multiple countries. Looking at how much some people charge for a single message (5 GBP), it looks like doing the manual work could make for a decent business if you have good hardware and a decent website setup. Especially if you offer services for countries where people have to register their ID to get a sim card working.

You absolutely could make some decent legit money from doing that. What countries do you need ID to get a sim card working ?

I'm not sure whether It will serve your needs, but check out this.

Can you vouch for this service ?

Quite a lot of countries apparently, require registering to get a sim card:
https://www.phonetravelwiz.com/phone-tra...istration/

I knew of a few countries. Looking into it, it seems registration is more common in the world than not.
In some countries, they even take fingerprints or face scans!