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Thank you for sharing such great information. However, I use bluetooth mainly with my Wireless speakers & smartwatch.
For file transfer i use wifi instead, faster & reliable.

You can reboot a VPS or dedicated server from your Webhost's Panel or the separate Control panel provided for them a the time of purchase.
You may also login to your service via SSH & use the reboot...

As RH-Calvin said you should as your provider.
Also, Majority of firms provide full root for VPS & Dedicated Services.
However, In the case of webhosting, they provide a sandboxed shell access.