Bluetooth smartphone is not detected!

Hello,
I want to use device_tracker by bluetooth (bluetooth_tracker) to detect a presence / absence.
I use two devices for that :
. an Android Xiaomi Redmi4A smartphone with bluetooth enabled
. a connected bracelet Xiaomi MiBand2
The bracelet is perfectly detected, while my smartphone is not detected in bluetooth!
Do you have a solution?
Thanks in advance for your help.
Cordially.

P.S. : The bluetooth works perfectly on my Raspberry Pi!
sudo hciconfig -a
hci0: Type: Primary Bus: USB
BD Address: xx:xx:xx:xx:xx:xx ACL MTU: 1021:8 SCO MTU: 64:1
UP RUNNING PSCAN
RX bytes:16243 acl:0 sco:0 events:1026 errors:0
TX bytes:40022 acl:0 sco:0 commands:642 errors:0
Features: 0xbf 0xfe 0xcf 0xfe 0xdb 0xff 0x7b 0x87
Packet type: DM1 DM3 DM5 DH1 DH3 DH5 HV1 HV2 HV3
Link policy: RSWITCH SNIFF
Link mode: SLAVE ACCEPT
Name: ‘raspi0’
Class: 0x000000
Service Classes: Unspecified
Device Class: Miscellaneous,
HCI Version: 4.1 (0x7) Revision: 0x16e4
LMP Version: 4.1 (0x7) Subversion: 0x220e
Manufacturer: Broadcom Corporation (15)

What the scan says about ?

Hello,
Thanks for your help, but I dropped the subject because the problem is not in Home-Assistant but between the raspberry-pi and my smartphone, and apparently there is no solution!
Very cordially.