Try these Codes on your DH-368 phone:
1. Power on.
2. Press 904059 + ‘MENU’
3. ‘TEST SET’ display …
4. Press ‘YES’ will display @ then press 1 ‘RCL’ will turn light off and you will see ‘DONE’
5. Press ‘YES’ will display @ then press 86 ‘RCL’ display ‘DONE’ also you will hear static… You can just enter the channel number (up to 1023) by pressing ‘Yes’ 3 ‘CLR’ XXXX – channel number to enter a channel directly. You can also see the signal level on channel by pressing 3 ‘MENU’. You can see the ESN number by pressing ‘YES’ 1 ‘RCL’ 96 in HEX format.
6. Press 3 to exit, now you phone will power down and power up again. You can install the phone number into the phone by pressing 923885 + ‘MENU’