My cordless telkomphone show a roaming warning when dialing a no is that normal can't connect if I don't say yes ?

Anna, I do not know what a "cordless cell phone" is.
If you mean a cell phone, it is on a Network, such as AT&T or Verizon.
"Roaming" usually means you are outside of the native area of the phone, either far from where you were when you activated the phone, or perhaps you are in a "dead spot" wherever you are currently, such as in a parking garage, out in the deep woods, etc.
Is the cell phone's phone number the exact same Area Code of where you live?
Have you changed Carriers, i.e. from Verizon to (ugh) Sprint?
Have you (or anyone else) changed the SIM card?
Are you making calls from a place that might be blocking the signal from the Cell tower?
Are you in a city or in a rural area.
"Roaming" indicates your phone thinks it is outside the area you subscribed to.
Roaming almost always is more expensive, so find out what is going on.

its okay, seems that someone have mis-changed your phone setting, go to setting & check call menu & disable the roaming feature, no worries from the warning, as long as you are using a landline, and roaming is just active in phone menu but not in network operator

are you overseas atm?

Yes.

Thi may or may not be the correct model, but since you did not specify it's hard to know.

http://www.telkomphones.co.za/manuals/Colombo%20Manual_090209.pdf

Hope that helps!

Place the telstra 8100 handset in the charger. Call any number while the handset is in the charger and it should dial out - you can hear the dial tone now. Take the handset out of the charger and you should be able to call normally.
cheers Matt

no dial tone mean the internal excitier is bad and yes they can be defective from the start

Did you ever got a solution for this

Try dialing *228 to update your roaming preferences. It should connect to verizon's automated roaming update service.

Unfortunately, it won't normally update if you are not already on a Verizon tower. If *228 will not connect, also try *22804, which attempts to push it through to the nearest Verizon tower, or *22890.

If you do get through, it will give you a welcome message, and ask you to select option 1 to reprogram, or option 2 to update roaming preferences. You will need to select option 2.

If you do not get through, unfortunately you will have to stop by a Verizon Wireless Corporate owned store and speak with their tech department. They will be able to tell you if you have the latest PRL (preferred roaming list) and also check to see if you have the latest firmware (which could be part of the issue). They will have the tools to manually reprogram the roaming listing in the phone.