Also interested to know. AFIAK Huawei is being used for all UK 5G rollouts, and there are already 1000s of masts up (though not commercially active yet) for 5G. Plus I imagine they have a very big marketshare of LTE kit going in as well.

Huawei is also the vast majority of cabinets for VDSL in the UK (the ECI alternative which was deployed has been pulled as was really low quality compared to the Huawei kit). My rough guess there is at least 20,000 DSLAMs on nearly every streeet corner that are built by Huawei.

At least in the UK it is hard to see how the country can run without this kit, and it would be an enormous undertaking to pull it out. I'm sure many other European countries are the same as Huawei's kit is definitely technically the best for this kind of stuff as far as my knowledge goes.