Deutsche Telekom used Huaweis OpenStack implementation.
I haven't found any information that this changed, so I assume it is still running completely on Huawei. At least they made sure that they still get chips from the US despite sanctions. ;-)
Telcos fell in love with OpenStack some years ago and went all in.
Biggest problem with OpenStack was you needed a lot of hardware to learn how to use it and the talent pool was quite small.
Deutsche Telekom used Huaweis OpenStack implementation.
I haven't found any information that this changed, so I assume it is still running completely on Huawei. At least they made sure that they still get chips from the US despite sanctions. ;-)