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‛