My Vtech 5.8GHZ phone lists all answered calls as 'missed calls'

From the user manual...

View a Call List Entry
1. Press CALLS when the handset is not in
use.
2. Scroll to browse through the Call list.
Dial a Call List Entry
• When the desired entry appears, press
/HOME or to dial.
Save a Call List Entry to the
phonebook
1. When the desired Call list entry displays,
press SELECT.
2. Scroll to To Phonebook then press SELECT.
3. Use the dialing keys to modify the number if
necessary, and then press SELECT.
4. Use the dialing keys to enter the name, and
then press SELECT to save.
Delete a Call List Entry
• When the desired Call list entry displays,
press DELETE.
Delete all Call List Entries
• Press MENU when the handset is not in use.
Scroll to Call log and then press SELECT.
Scroll to Delete all and then press SELECT
twice.

Following url for manual.

https://auphones.vtech.com/home-phones/cordless-phones/302

You're kidding, right. They're MISSED calls. That means they called and you weren't there. The phone stores the number to let you know they tried. The only thing you can do to "answer" them, is to call them back yourself at the number listed.

How do I delete missed call numbers from my Vtech DECT 6.0 Cordless Phone with Digital Answering System.

Most of the telecom service providers offer call blocking features. In addition to this, most of the vtech cordless phone sets have built-in features through which you can block incoming calls from a specific number.

1. • Create a "Call Block List" on the vtech phone and store the Caller ID information of unwanted callers in the list. The numbers you feed in the block list will get a busy signal every time they try to call you.
     
   • Ring up the customer service of the telecom company that is providing you the phone service. Tell the representative that you want to get your incoming calls blocked from a specific number. The company will then add that number to a list of blocked numbers for your particular phone number. In the future, every time an unwanted caller tries to ring you up, he will hear a recording saying the number has been blocked.
     
   • Visit the website donotcall.gov. Add your phone number to the website's list of phone numbers that cannot be reached by telemarketers and businesses.
     

Since you didn't specify the model of your VTech DECT 6.0 phone I can't give a definite answer, but many models have a button marked "CID" (possibly with an arrow or something else). Then the cursor buttons navigate through the list.

Enter the model of your phone into the search box at
http://www.vtechphones.com/vtechphones/index.cfm/support/general/manuals/
to get a copy of the manual.

Open the caller ID screen and scroll through the recent calls. Hope this helps =]

Without knowing the model of your phone I can't give you a definite answer, but on many VTech phones you press the CID button to see the call history. UP/DOWN scrolls through the list. The DELETE button deletes the item.

If you need a manual, enter the model number into the search box at
http://www.vtechphones.com/vtechphones/index.cfm/support/general/manuals/

Since you declined to specify the model of your Uniden phone, I can only direct you to select it from the list beginning at
http://www.uniden.com/scat/cordlessphones_mnl
to download a copy of the manual.

dear sir from call register option in phone you can check it

The message indicator is the phone alerting you that you have missed calls. Press the CID button (the up arrow) then menu. You are now in the call list. Scroll through it (using up & down arrows) making sure to view all calls with the word NEW next to them. Alternatively, you can press menu while in the call list and then choose delete all this will erase the entire list.

The light also blinks to indicate voice mail. Many phone providers offer this service for free and you should contact them to ask if you have it / how to check it.