I think all modern Ericsson mobile network base stations use Erlang (at least for the configuration part) so most likely just using your phone you come in conta

I think all modern Ericsson mobile network base stations use Erlang (at least for the configuration part) so most likely just using your phone you come in contact with an Erlang system everyday (depending on what gear your ISP use, but Ericsson is one of the largest providers of telecom equipment).