Guide me to get Apple Mobile Device Service

In order to keep my apple device up-to-date and running in proper condition, I want a service that can support me at every phase of apple device errors. Though, I have no idea how to grab such dependable service so I started to wander here and there but nothing helps. Please someone guide me to grab Apple Mobile Device Service that can overcome issues which I am facing while using my apple devices.
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Georgia, Computer, Guide me to get Apple Mobile Device Service