Samsung iDCS 18D Office Phone

Assuming you have the programming manual, you need to program trunk 702 to ring to the operator group 500 in MMC 406 in the software programming manual.

Try plugging it into a different jack. If there's no change, the phone is bad. If it works ok, the port in the phone system is bad. Switch it to a spare port, if available.

First prove it is not a faulty handset. Find someone elses phone that is the same model as yours and rings then plug it into your line. If that phone rings your handset is faulty. If the borrowed phone will not ring but flashes then it is programming

I would suggest the power supply in your phone system needs replacing as it is making the phone system do things it shouldnt

leave yourself another message to re activate the message tone. When you clear the new message it should reset the message wait tone

You may download the manual from Product Support

You apparently have unheard messages on the voicemail system provided by your telephone company. This system records messages when someone calls while you're already on the phone. Please contact your telephone company for instructions on accessing their voicemail system.

The User guide for Samsung iDCS 18D

http://www.a1bizcom.com/files/idcs16ug.pdf

got the scoop on how to change the date and time. first while handset is on hook press TRSF then dial 200 Dial 1234 the display shows enable cus prog dial 1 to enable then press TRSF To change the date and time from here out press TRSF and dial 505 the display will show : (this is an example)
old: 6010104:0047
new:WMMDDYY:HHMM
Enter the new time and date using the above format and the system will return to step 2. Verify the time and date and re enter if necessary Press TRSF to store and exit. or press SPK to store and advance to the next program.