There are two main types of telecommunications services as basic services and supplementary services. Use for your reference and study.
Basic services: These are available to all subscribers to a mobile network. For example, the ability to make voice telephone calls is a basic service.
Supplementary services: These are additional services that are available by subscription only. Call forwarding is an example of a supplementary service.
In addition, basic telecommunication services can be divided into two main categories as Teleservices and Bearer Services. Know all about these things and GSM services in this presentation. Use for your reference and study.
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