why my iphone x is showing sim not supported

Is your iPhone, perhaps, carrier-locked? If so, only the carrier to whom it is locked can release their lock, and allow you to use the phone with a different carrier – if they choose to do so.

How to unlock your iPhone for use with a different carrier - Apple Support

Learn what to do if you see a SIM not supported alert.

If you see No Service, Searching, or SOS on your iPhone or iPad

1. Check your coverage area. ... 
2. If you see SOS or SOS only. ... 
3. If you're on 3G network. ... 
4. Restart your iPhone or iPad. ... 
5. Check for a Carrier Settings update. ... 
6. Turn your cellular line off and back on. ... 
7. Reset your Network Settings. ... 
8. Update your iPhone or iPad.

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If you see No Service, Searching, or SOS on your iPhone or iPad

To be able to use any SIM across the globe you must have "No SIM Restriction" against Network Provider Lock. Please refer to the pic below.