unlock my iphone, i want to unlock my phone 14 with IEMI : 35 355767 374167 6

Are you a T-Mobile USA customer?  Does your device meet all of the SIM Unlock Policy requirements at the link below? 

https://www.t-mobile.com/responsibility/consumer-info/policies/sim-unlock-policy

If not.  T-Mobile can not SIM unlock your device.  If so.  Follow the instructions in the link to verify your account and devuce elogibility and request the SIM unlock for your device.