5 types of service...alerting, procedural, basic, traffic, deconfliction.
If you are classifying services in ICAO terms we should start with Air Traffic Services which consist of the Air Traffic Control Service, the Flight Information Service and the Alerting Service. In the UK the FIS has been further sub-divided into basic, traffic, deconfliction and procedural services. The Alerting service is a separate entity and, if we're getting pedantic, it should not be considered as part of the FIS.