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Ericsson abandoned Erlang, or Erlang abandoned Ericsson, depending on how you look: Ericsson banned it internally, and shortly afterwards when the Erlang team managed to get it open sourced, they resigned from Ericsson and founded their own Erlang company.

(source: http://webcem01.cem.itesm.mx:8005/erlang/cd/downloads/hopl_e...)

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Armstrong was rehired by Ericsson in 2004 [1], and a team at Ericsson maintains the language today (see e.g. [2]).

1: http://erlang.org/pipermail/erlang-questions/2006-July/02136... 2: http://blog.erlang.org/

So does Ericsson still use Erlang in their recent network hardware etc?

I recall hearing no, somewhere. I am under the understanding, (don't know where from) that Cisco DOES use Erlang in their stack, and there is a group of people at VMware that does.

Thanks. This is something where simple internet search yields nothing much. Possibly because these network switches are proprietary platforms and they do not publish how internals are implemented.

I found the Cisco reference https://twitter.com/guieevc/status/1002494428748140544?s=09

Yes. After a few years of ban, Ericsson changed gears. The recent head of tech at Ericsson look at that past as a real miss. All Ericsson 3G switch/router are in Erlang.

Ericsson has a small team maintaining erlang and they are the steward of Erlang.

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