The message light keeps flashing although i deleted all messages

You 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.

for sending text messages :
1.go to your message settings and check the message center number to see if it is correct
2. call to your network operator customer care
3. request the message center number...
4.note it down
5. go to message settings>message center number
6. insert the number which is noted by you and save it

this solves your messaging problem ...
Good luck

I had the same issue on my RCA 25255re2 and worked with customer service at RCA. They had me hold down the delete button for 5 seconds, release the delete button, then press delete one more time. That cleared the phantom L1 message waiting issue we were having at my office

Need to login to the phone systems and reset it

You have a phone with built in answering machine.

This flashing light means you have a message. Just listen to the message, and delete it, then the light will go away.
Perhaps there are many messages.
You need to listen to them all

It can also indicate you have messages on your SIM that are not yet copied to your phone.

Go to messages -> Options -> SIM Messages and delete or copy these messages and the blinking icon should dissapear.

the message box is full or some unread messages are there in between messages if one is there also you wil get the same one more thing is that if you delete the message with out reading it then the message alert shows so goto the deleted messages and delete all forever........then seeeee your problem will be gone

Have you tried the telco message waiting clear?

Options, 10, *, Line Key

Try for each line key and see if that helps.

This sounds like you have a call back message active on your phone, The callback is a through back to the days before we had Voice-mail, if you wanted a person to call you back you could activate their message light by pressing your message key while the called phone was ringing. To remove the light you would lift your handset and press the message key then select which party you wished to "callback", once the call was answered at the other end the light would be extinguished. Give this a try, I bet you will be surprised at the results.

Here are sample paragraphs from the user manual : hope it helps !

The new message LED on the handset flashes when you have new messages in your
answering system. The LED stops flashing when all new messages are played back.

3) To delete all messages, press delete messege in standby mode. Press delete
messege again after the announcement "To delete all messages, press delete
again."
When you try to delete all messages without first listening to your new messages,
you hear several short beeps followed by an announcement "Please playback all
messages." This protects you from accidentally erasing messages you have not yet
reviewed.
Important:
When you press delete messege, you are permanently deleting the message. Once
deleted, the message cannot be replayed or retrieved.