The visual ringer keeps flashing on my uniden cordless phone

I CALLED UNIDEN WITH THE SAME PROBLEM.

THE VISUAL RINGER IS FLASHING WHEN YOU HAVE OLD EMAILS. YOU HAVE TO DELETE THE OLD EMAILS

It is the indicator that you have a voice mail (answering service that comes with your phone provider. Contact them to tell you how to access it.
to access iprimus voice mail, dial your own number it will then ask for your PIN, if you have not set this up the default number is your area code ie. 02 Sydney 03 Melbourne etc. and the last 2 numbers of your phone number

You should be able to find the solution from within the Uniden Manual.

All the manuals for Unidens phones can be located via the link below:

http://www.uniden.com.au/AUSTRALIA/cs_operating_manuals.asp

If for some reason you cannot locate it there then use the next link to look for a discontinued product:

http://www.uniden.com.au/AUSTRALIA/cs_discontinued_products.asp

NOTE: The websites above are the Australian sites. If you reside in a different country you may have to navigate to your country's website for Uniden. Some products (manuals etc...) are not available in all countries.

I hope this is helpful. Regards,