Why? Ericsson has always been a back-end networking and telecommunication company.

Erlang was created, at Ericsson, for a telephony switch.

It's shuttered the consumer side entirely (Sony Ericsson was a joint venture, not a group), it's one of the lead developers in mobile telephony, as well as the lead IP holder in the domain.

In Europe also a large player in the broadcast space, though Red Bee Media (formerly Ericsson Broadcast and Media Services): BBC, Channel 4, ITV, Canal+, as well as Channel 4 and Channel 5's VOD. RBM is also a huge provider of closed captioning, signing, and audio description worldwide, by far the largest in europe for more than 15 years (after they acquired Mundovisión and Titelbild).

If the parent was typing the above message on a phone attached to their telecom network, there is a high probability their user and control plane traffic was going through Ericsson systems.