curl --request GET \
  --url https://api.eflow.team/v1/meta/mobilecarriers \
  --header 'X-Eflow-Api-Key: <api-key>'

{
  "mobile_carriers": [
    {
      "mobile_carrier_id": 123,
      "carrier_name": "<string>",
      "carrier_code": 123,
      "country_id": 123
    }
  ]
}