Phone has a dial tone but will not dial

Just press top left (R/<-) button about 3 sec. and a letter changes (p - pulse or t - tone).

they are either restricted or what you are hearing is intercom tone and not dial tone. the phones may be set to dial out from a diffrent line grop as well have you tried dialing 81 82 instead of 9 and see what happens

The steps are outlined in the article below:

D900 FAQ – How do I disable or mute the keypad tone on my SGH-D900? admin ⋅ March 6, 2009 --> Note: In order to disable the keypad tone, the Dialing Display Font Type must first be set to “Normal”
To change the dialing display font type follow the steps below:

1. From the standby screen, press the left soft key for Menu
2. Select Settings (9)
3. Select Display Settings (3)
4. Select Dialing Display (6)
5. Select Font Type (1)
6. Highlight either Normal or Theme, using the navigation keys
7. Press the left soft key to Save the Dialing Display Font Type setting

To turn off the keypad tone follow the steps below:

1. From the standby screen, press the left soft key for Menu
2. Select Settings (9)
3. Select Sound Settings (4)
4. Select Keypad Tone (2)
5. Highlight Off, using the up navigation key
6. Press the left soft key to Save the Keypad Tone setting

The problem was the main phone line not the phone itself

There are two wires going to your phone. Inside the wall jack, switch the red and green wires and the keypad should work .

I disconnected the RadioShack phone/answering machine and plugged in an old phone. At first I didn't get a dial tone, but in a minute or so, I did get one. I doublechecked the connection with the incoming phone jack. (I had checked this before, but didn't see anything wrong.) Again, I didn't see anything wrong, but maybe that did it. Also, when I disconnected the RadioShack from the incoming phone jack, I disconnected from my computer (I used to have dial-up connection).

Don't know which of my actions worked, but now I have dial tone on Radio Shack.
Hoooooooray!!!!

The problem is possibly the keypad on the phone. Try another phone , preferrably a standard corded phone. If you still cannot break the dial tone, then the problem is with the telephone line (phone company)

you must use a ac adapter which the phone doesnt come with or 3 double A batteries

the links tat r there inside the phone are shorted as they r very thin threads like..just go to a repairer and he will resoulder the links and the problem will be solved..for temporary work just open the phone and remove all dust ..mostly keypad will start working

Change the DTMF found in phone settings (Initial Set-up) to either short or long. When this is set to off, the voicemail cannot pick up the numbers you type.