just one phone can finde ble nrf51422 why is that?

[navid]

hi im using nrf51422 v2 with external sdk v6 with softdevice v7 im running one of example that its name is ble_app_template and when i run it , it show up for just one phone and the others phone cant detect it . what is problem?

[FormerMember]

1. Do the other phones support BLE, Bluetooth 4.0?
2. Do you have made any changes to the example, like adding directed advertising for example?

[navid]

its 4.4 and i test nrf master control but its not detecting anything