Many of the "What is this..." sites provide good references, but many also try to sell you something or get you to download their software.
Do NOT buy or download anything from any checker site - use them as a reference only.
There are a few references to TBservice - it might help if you look at at Task Manager and add the Process Name and Command line columns to be certain what TBservice is running. Scroll down the list until you find TBservice - then determine where the exe lives. Using the information from Process Checker - you can tell what TBservice is running.
It's probably the MS tether service pyramid10 mentioned, but it's always better to be sure.
I'll go out on a limb and suggest that it is the Phone app ... I'm not sure if you need it or if it can be uninstalled with Right click / uninstall. You might have to use the powershell remove-appx cmdlet if you don't want or need the Phone app (if it is the phone app )
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