I search at google and found that
hardreset24.com/free_imei_check/HTC/
after typing IMEI get instant information
IMEI: 3561240812xxxx
Model: HTC U 11
Serial Number: HT76G18xxxx
Part: 99HAMP044-00
Series: OCEAN#UHL-M8
Part Description: SKU , EE , English-WWE , GBR , HTC , EE UK , 4G/64G , Bootloader Lock , Brilliant Black , DEF00 , w/ SIM Lock , OCEAN#UHL-M8
Customer Description: EVERYTHING EVERYWHERE LIMITED
Country: UNITED KINGDOM
Warranty start: 2017/06/20
Warranty end: 2019/09/20
that this phone is under warranty and have "Bootloader Lock" what is it ?
I'm new in android phones
Regards